SimpleMDE Editor Styles (SASS versions)

simplemde.sass

// current as of build b59279a3d8d186016398f81cc1d8d5645a44d128 (Nov. 2, 2015)
// https://github.com/NextStepWebs/simplemde-markdown-editor/commit/b59279a3d8d186016398f81cc1d8d5645a44d128

.CodeMirror
  height: auto
  min-height: 300px
  border: 1px solid #ddd
  border-bottom-left-radius: 4px
  border-bottom-right-radius: 4px
  padding: 10px
  font: inherit
  z-index: 1

.CodeMirror-scroll
  min-height: 300px

.CodeMirror-fullscreen
  background: #fff
  position: fixed !important
  top: 50px
  left: 0
  right: 0
  bottom: 0
  height: auto
  z-index: 9

.CodeMirror-sided
  width: 50% !important

.editor-toolbar
  position: relative
  opacity: .6
  -webkit-user-select: none
  -moz-user-select: none
  -ms-user-select: none
  -o-user-select: none
  user-select: none
  padding: 0 10px
  border-top: 1px solid #bbb
  border-left: 1px solid #bbb
  border-right: 1px solid #bbb
  border-top-left-radius: 4px
  border-top-right-radius: 4px
  &:after
    display: block
    content: ' '
    height: 1px
  &:before
    display: block
    content: ' '
    height: 1px
    margin-bottom: 8px
  &:after
    margin-top: 8px
  &:hover
    opacity: 0.8

.editor-wrapper input.title
  &:focus, &:hover
    opacity: 0.8

.editor-toolbar
  &.fullscreen
    width: 100%
    height: 50px
    overflow-x: auto
    overflow-y: hidden
    white-space: nowrap
    padding-top: 10px
    padding-bottom: 10px
    box-sizing: border-box
    background: #fff
    border: 0
    position: fixed
    top: 0
    left: 0
    opacity: 1
    z-index: 9
    &::before
      width: 20px
      height: 50px
      background: -moz-linear-gradient(left, rgba(255, 255, 255, 1) 0%, rgba(125, 185, 232, 0.01) 100%)
      background: -webkit-gradient(linear, left top, right top, color-stop(0%, rgba(255, 255, 255, 1)), color-stop(100%, rgba(125, 185, 232, 0.01)))
      background: -webkit-linear-gradient(left, rgba(255, 255, 255, 1) 0%, rgba(125, 185, 232, 0.01) 100%)
      background: -o-linear-gradient(left, rgba(255, 255, 255, 1) 0%, rgba(125, 185, 232, 0.01) 100%)
      background: -ms-linear-gradient(left, rgba(255, 255, 255, 1) 0%, rgba(125, 185, 232, 0.01) 100%)
      background: linear-gradient(to right, rgba(255, 255, 255, 1) 0%, rgba(125, 185, 232, 0.01) 100%)
      filter: "progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='#037db9e8', GradientType=1)"
      position: fixed
      top: 0
      left: 0
      margin: 0
      padding: 0
    &::after
      width: 20px
      height: 50px
      background: -moz-linear-gradient(left, rgba(125, 185, 232, 0.01) 0%, rgba(254, 254, 255, 1) 99%, rgba(255, 255, 255, 1) 100%)
      background: -webkit-gradient(linear, left top, right top, color-stop(0%, rgba(125, 185, 232, 0.01)), color-stop(99%, rgba(254, 254, 255, 1)), color-stop(100%, rgba(255, 255, 255, 1)))
      background: -webkit-linear-gradient(left, rgba(125, 185, 232, 0.01) 0%, rgba(254, 254, 255, 1) 99%, rgba(255, 255, 255, 1) 100%)
      background: -o-linear-gradient(left, rgba(125, 185, 232, 0.01) 0%, rgba(254, 254, 255, 1) 99%, rgba(255, 255, 255, 1) 100%)
      background: -ms-linear-gradient(left, rgba(125, 185, 232, 0.01) 0%, rgba(254, 254, 255, 1) 99%, rgba(255, 255, 255, 1) 100%)
      background: linear-gradient(to right, rgba(125, 185, 232, 0.01) 0%, rgba(254, 254, 255, 1) 99%, rgba(255, 255, 255, 1) 100%)
      filter: "progid:DXImageTransform.Microsoft.gradient( startColorstr='#037db9e8', endColorstr='#ffffff', GradientType=1)"
      position: fixed
      top: 0
      right: 0
      margin: 0
      padding: 0
  a
    display: inline-block
    text-align: center
    text-decoration: none !important
    color: #2c3e50 !important
    width: 30px
    height: 30px
    margin: 0
    border: 1px solid transparent
    border-radius: 3px
    cursor: pointer
    &.active, &:hover
      background: #fcfcfc
      border-color: #95a5a6
    &:before
      line-height: 30px
  i.separator
    display: inline-block
    width: 0
    border-left: 1px solid #d9d9d9
    border-right: 1px solid #fff
    color: transparent
    text-indent: -10px
    margin: 0 6px
  a
    &.fa-header-x:after
      font-family: Arial, "Helvetica Neue", Helvetica, sans-serif
      font-size: 65%
      vertical-align: text-bottom
      position: relative
      top: 2px
    &.fa-header-1:after
      content: "1"
    &.fa-header-2:after
      content: "2"
    &.fa-header-3:after
      content: "3"
    &.fa-header-bigger:after
      content: "▲"
    &.fa-header-smaller:after
      content: "▼"
  &.disabled-for-preview a:not(.no-disable)
    pointer-events: none
    background: #fff
    border-color: transparent
    text-shadow: inherit

@media only screen and (max-width: 700px)
  .editor-toolbar a.no-mobile
    display: none

.editor-statusbar
  padding: 8px 10px
  font-size: 12px
  color: #959694
  text-align: right
  span
    display: inline-block
    min-width: 4em
    margin-left: 1em
  .lines:before
    content: "lines: "
  .words:before
    content: "words: "

.editor-preview
  padding: 10px
  position: absolute
  width: 100%
  height: 100%
  top: 0
  left: 0
  background: #fafafa
  z-index: 2
  overflow: auto
  display: none
  box-sizing: border-box

.editor-preview-side
  padding: 10px
  position: fixed
  bottom: 0
  width: 50%
  top: 50px
  right: 0
  background: #fafafa
  z-index: 9999
  overflow: auto
  display: none
  box-sizing: border-box
  border: 1px solid #ddd

.editor-preview-active-side, .editor-preview-active
  display: block

.editor-preview > p, .editor-preview-side > p
  margin-top: 0

.editor-preview pre, .editor-preview-side pre
  background: #eee
  margin-bottom: 10px

.editor-preview table
  td, th
    border: 1px solid #ddd
    padding: 5px

.editor-preview-side table
  td, th
    border: 1px solid #ddd
    padding: 5px

.CodeMirror
  .CodeMirror-selected
    background: #d9d9d9
  .CodeMirror-code
    .cm-header-1
      font-size: 200%
      line-height: 200%
    .cm-header-2
      font-size: 160%
      line-height: 160%
    .cm-header-3
      font-size: 125%
      line-height: 125%
    .cm-header-4
      font-size: 110%
      line-height: 110%
    .cm-comment
      background: rgba(0, 0, 0, 0.05)
      border-radius: 2px
    .cm-link
      color: #7f8c8d
    .cm-url
      color: #aab2b3
    .cm-strikethrough
      text-decoration: line-through

simplemde.scss

// current as of build b59279a3d8d186016398f81cc1d8d5645a44d128 (Nov. 2, 2015)
// https://github.com/NextStepWebs/simplemde-markdown-editor/commit/b59279a3d8d186016398f81cc1d8d5645a44d128

.CodeMirror {
  height: auto;
  min-height: 300px;
  border: 1px solid #ddd;
  border-bottom-left-radius: 4px;
  border-bottom-right-radius: 4px;
  padding: 10px;
  font: inherit;
  z-index: 1;
}

.CodeMirror-scroll {
  min-height: 300px;
}

.CodeMirror-fullscreen {
  background: #fff;
  position: fixed !important;
  top: 50px;
  left: 0;
  right: 0;
  bottom: 0;
  height: auto;
  z-index: 9;
}

.CodeMirror-sided {
  width: 50% !important;
}

.editor-toolbar {
  position: relative;
  opacity: .6;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  -o-user-select: none;
  user-select: none;
  padding: 0 10px;
  border-top: 1px solid #bbb;
  border-left: 1px solid #bbb;
  border-right: 1px solid #bbb;
  border-top-left-radius: 4px;
  border-top-right-radius: 4px;
  &:after {
    display: block;
    content: ' ';
    height: 1px;
  }
  &:before {
    display: block;
    content: ' ';
    height: 1px;
    margin-bottom: 8px;
  }
  &:after {
    margin-top: 8px;
  }
  &:hover {
    opacity: 0.8;
  }
}

.editor-wrapper input.title {
  &:focus, &:hover {
    opacity: 0.8;
  }
}

.editor-toolbar {
  &.fullscreen {
    width: 100%;
    height: 50px;
    overflow-x: auto;
    overflow-y: hidden;
    white-space: nowrap;
    padding-top: 10px;
    padding-bottom: 10px;
    box-sizing: border-box;
    background: #fff;
    border: 0;
    position: fixed;
    top: 0;
    left: 0;
    opacity: 1;
    z-index: 9;
    &::before {
      width: 20px;
      height: 50px;
      background: -moz-linear-gradient(left, rgba(255, 255, 255, 1) 0%, rgba(125, 185, 232, 0.01) 100%);
      background: -webkit-gradient(linear, left top, right top, color-stop(0%, rgba(255, 255, 255, 1)), color-stop(100%, rgba(125, 185, 232, 0.01)));
      background: -webkit-linear-gradient(left, rgba(255, 255, 255, 1) 0%, rgba(125, 185, 232, 0.01) 100%);
      background: -o-linear-gradient(left, rgba(255, 255, 255, 1) 0%, rgba(125, 185, 232, 0.01) 100%);
      background: -ms-linear-gradient(left, rgba(255, 255, 255, 1) 0%, rgba(125, 185, 232, 0.01) 100%);
      background: linear-gradient(to right, rgba(255, 255, 255, 1) 0%, rgba(125, 185, 232, 0.01) 100%);
      filter: "progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='#037db9e8', GradientType=1)";
      position: fixed;
      top: 0;
      left: 0;
      margin: 0;
      padding: 0;
    }
    &::after {
      width: 20px;
      height: 50px;
      background: -moz-linear-gradient(left, rgba(125, 185, 232, 0.01) 0%, rgba(254, 254, 255, 1) 99%, rgba(255, 255, 255, 1) 100%);
      background: -webkit-gradient(linear, left top, right top, color-stop(0%, rgba(125, 185, 232, 0.01)), color-stop(99%, rgba(254, 254, 255, 1)), color-stop(100%, rgba(255, 255, 255, 1)));
      background: -webkit-linear-gradient(left, rgba(125, 185, 232, 0.01) 0%, rgba(254, 254, 255, 1) 99%, rgba(255, 255, 255, 1) 100%);
      background: -o-linear-gradient(left, rgba(125, 185, 232, 0.01) 0%, rgba(254, 254, 255, 1) 99%, rgba(255, 255, 255, 1) 100%);
      background: -ms-linear-gradient(left, rgba(125, 185, 232, 0.01) 0%, rgba(254, 254, 255, 1) 99%, rgba(255, 255, 255, 1) 100%);
      background: linear-gradient(to right, rgba(125, 185, 232, 0.01) 0%, rgba(254, 254, 255, 1) 99%, rgba(255, 255, 255, 1) 100%);
      filter: "progid:DXImageTransform.Microsoft.gradient( startColorstr='#037db9e8', endColorstr='#ffffff', GradientType=1)";
      position: fixed;
      top: 0;
      right: 0;
      margin: 0;
      padding: 0;
    }
  }
  a {
    display: inline-block;
    text-align: center;
    text-decoration: none !important;
    color: #2c3e50 !important;
    width: 30px;
    height: 30px;
    margin: 0;
    border: 1px solid transparent;
    border-radius: 3px;
    cursor: pointer;
    &.active, &:hover {
      background: #fcfcfc;
      border-color: #95a5a6;
    }
    &:before {
      line-height: 30px;
    }
  }
  i.separator {
    display: inline-block;
    width: 0;
    border-left: 1px solid #d9d9d9;
    border-right: 1px solid #fff;
    color: transparent;
    text-indent: -10px;
    margin: 0 6px;
  }
  a {
    &.fa-header-x:after {
      font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
      font-size: 65%;
      vertical-align: text-bottom;
      position: relative;
      top: 2px;
    }
    &.fa-header-1:after {
      content: "1";
    }
    &.fa-header-2:after {
      content: "2";
    }
    &.fa-header-3:after {
      content: "3";
    }
    &.fa-header-bigger:after {
      content: "▲";
    }
    &.fa-header-smaller:after {
      content: "▼";
    }
  }
  &.disabled-for-preview a:not(.no-disable) {
    pointer-events: none;
    background: #fff;
    border-color: transparent;
    text-shadow: inherit;
  }
}

@media only screen and (max-width: 700px) {
  .editor-toolbar a.no-mobile {
    display: none;
  }
}

.editor-statusbar {
  padding: 8px 10px;
  font-size: 12px;
  color: #959694;
  text-align: right;
  span {
    display: inline-block;
    min-width: 4em;
    margin-left: 1em;
  }
  .lines:before {
    content: "lines: ";
  }
  .words:before {
    content: "words: ";
  }
}

.editor-preview {
  padding: 10px;
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background: #fafafa;
  z-index: 2;
  overflow: auto;
  display: none;
  box-sizing: border-box;
}

.editor-preview-side {
  padding: 10px;
  position: fixed;
  bottom: 0;
  width: 50%;
  top: 50px;
  right: 0;
  background: #fafafa;
  z-index: 9999;
  overflow: auto;
  display: none;
  box-sizing: border-box;
  border: 1px solid #ddd;
}

.editor-preview-active-side, .editor-preview-active {
  display: block;
}

.editor-preview > p, .editor-preview-side > p {
  margin-top: 0;
}

.editor-preview pre, .editor-preview-side pre {
  background: #eee;
  margin-bottom: 10px;
}

.editor-preview table {
  td, th {
    border: 1px solid #ddd;
    padding: 5px;
  }
}

.editor-preview-side table {
  td, th {
    border: 1px solid #ddd;
    padding: 5px;
  }
}

.CodeMirror {
  .CodeMirror-selected {
    background: #d9d9d9;
  }
  .CodeMirror-code {
    .cm-header-1 {
      font-size: 200%;
      line-height: 200%;
    }
    .cm-header-2 {
      font-size: 160%;
      line-height: 160%;
    }
    .cm-header-3 {
      font-size: 125%;
      line-height: 125%;
    }
    .cm-header-4 {
      font-size: 110%;
      line-height: 110%;
    }
    .cm-comment {
      background: rgba(0, 0, 0, 0.05);
      border-radius: 2px;
    }
    .cm-link {
      color: #7f8c8d;
    }
    .cm-url {
      color: #aab2b3;
    }
    .cm-strikethrough {
      text-decoration: line-through;
    }
  }
}

For a Stylus version (.styl) of the same file, see: https://gist.github.com/brossi/b9d09c34a76bba988fe3