gitlabhq/app/assets/stylesheets/issues.css.scss

.issue-number {
  float: left;
  border-radius: 5px;
  text-shadow: none;
  background: rgba(0, 0, 0, 0.12);
  text-align: center;
  padding: 14px 8px;
  width: 40px;
  margin-right: 10px;
  color: #444;
}

.issues_filter {
  margin-top:10px;
  .left {
    margin-right:15px;
  }
}

.top_panel_issues{
  #issue_search_form {
    margin:5px 0;
    input {
      border:1px solid #D3D3D3;
      padding: 3px;
      height: 28px;
      width: 300px;
      -webkit-appearance:none;
      box-sizing: border-box;
      -moz-box-sizing: border-box;

      &:focus {
        border-color:#c2e1ef;
      }
    }
  }
}

/** ISSUES LIST **/
.issue .action-links {
  display:none;
  a {
    margin-left:10px;
  }
}
.issue:hover .action-links { display:block; }