glowing button

glowing-button.markdown

glowing button

A Pen by Sebastian Rothbucher on CodePen.

License.

index.html

<button class="bt" onclick="alert('whatever')">Hey there</button>

style.less

body {
  background: grey;
}

.bt {
  -webkit-appearance: none;
  -moz-appearance: none; 
  -ms-appearance: none;
  appearance: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none; 
  
  padding: 0;
  display: inline-block;
  position: relative;
  border: 0;
  background: none;
  color: white;
  padding: 8px;
  font-size: 1.2em;
  overflow: hidden;
  
  &::before { // per se out, comes in during hover
    display: block;
    content: ' ';
    position: absolute;
    top: 0;
    left: -100%;
    height: 100%;
    height: calc(100% - 3px);
    width: 100%;
    z-index: -1;
    background: linear-gradient(90deg, lighten(#38AECC, 15%) 60%, darken(#38AECC, 5%)); // thanks, coolors.co
    border: 0;
    border-bottom: 3px solid #044389; // again
    border-radius: 1px 0 0 1px;
    transition: left 0.1s;
  }
  
  &:hover::before { // coming in
    border-radius: 1px;
    left: 0;
  }
  
  &::after { // per se in, going out during hover ()could consolidate, but so what now)
    display: block;
    content: ' ';
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    height: calc(100% - 3px);
    width: 100%;
    z-index: -1;
    background: darken(#38AECC, 5%); // thanks, coolors.co
    border: 0;
    border-bottom: 3px transparent;
    border-radius: 1px;
    transition: left 0.1s;
  }
  
  &:hover::after { // going out
    border-radius: 0 1px 1px 0;
    left: 100%;
  }
}