min.css

div.issue-preview-widget .issue-info{padding-right:5px}div.issue-preview-widget .issue-article-category{color:#012b65;text-transform:uppercase;display:block;font-size:10px;font-weight:700}div.issue-preview-widget .issue-article-title{margin-top:10px;font-family:"Playfair Display";text-transform:capitalize;letter-spacing:0;font-weight:400;font-style:normal;color:#000;opacity:1;visibility:visible;margin-top:0;margin-bottom:10px;font-size:16px}div.issue-preview-widget .issue-title{position:relative;font-size:1.563em;font-family:"Playfair Display";text-transform:capitalize;letter-spacing:0;font-weight:400;font-style:normal;color:#000;opacity:1;visibility:visible}.issue-preview-widget .issue-article-list:before{font-size:12px;font-family:"Open Sans";color:#1e73be;display:inline;padding:0 4px;margin-bottom:4px;text-transform:uppercase;font-weight:700!important;letter-spacing:-1px}div.issue-preview-widget a.button{font-family:"Playfair Display";text-transform:uppercase;background-color:#012b65;color:#FFF;border:0 solid;font-size:13px;line-height:1.4em;margin-bottom:5px;margin-right:4px;padding:12px 18px;cursor:pointer;display:inline-block}div.issue-preview-widget a.button:hover{background-color:#1e73be}

which-50-issue-widget-sidebar-style.html

<style>
  
/*
  Customise CSS Sidebar Issue widget, place in wordpress theme header
*/
div.issue-preview-widget {
  border: none
}
div.issue-preview-widget .issue-info {
  padding-right: 5px;
}

div.issue-preview-widget .issue-magazine-title {
  display: none;
}
  
div.issue-preview-widget .issue-article-category {
    color: #012b65;
    text-transform: uppercase;
    display: block;
    font-size: 10px;
    font-weight: bold;
}

div.issue-preview-widget .issue-article-title {
  margin-top: 10px;
  font-family: "Playfair Display";
  text-transform: capitalize;
  letter-spacing: 0px;
  font-weight: 400;
  font-style: normal;
  color: #000000;
  opacity: 1;
  visibility: visible;
  margin-top: 0;
  margin-bottom: 10px;
  font-size: 16px;
}

div.issue-preview-widget .issue-title {
  position: relative;
  font-size: 1.563em;
  font-family: "Playfair Display";
  text-transform: capitalize;
  letter-spacing: 0px;
  font-weight: 400;
  font-style: normal;
  color: #000000;
  opacity: 1;
  visibility: visible;
}

.issue-preview-widget .issue-article-list:before {
  font-size: 12px !important;
  font-family: "Open Sans";
  color: #1e73be;
  display: inline;
  padding: 0px 4px;
  margin-bottom: 4px;
  text-transform: uppercase;
  font-weight: bold !important;
  letter-spacing: -1px;
}

div.issue-preview-widget a.button {
  font-family: "Playfair Display";
  text-transform: uppercase;
  background-color: #012b65;
  color: #FFFFFF;
  border: 0px solid;
  font-size: 13px;
  line-height: 1.4em;
  margin-bottom: 5px;
  margin-right: 4px;
  padding: 12px 18px;
  cursor: pointer;
  display: inline-block;
}

div.issue-preview-widget a.button:hover {
  background-color: #1e73be;
}
</style>