dev.ttsby.com/modules/post/themes/_desktop/bs4-default/_main.css

/* form */
.dropdown-filter .dropdown-toggle {
  position: relative;
  text-align: left;
  min-width: 10rem
}

.dropdown-filter .dropdown-toggle::after {
  position: absolute;
  top: 50%;
  right: 10px;
  margin-top: -2px;
}

.dropdown-filter.show .dropdown-toggle::after {
  border-bottom: .3em solid;
  border-top: 0;
}

.dropdown-menu {
  border-radius: 0;
}

.input-group .form-control:focus {
  border-color: #ced4da;
  outline: 0;
  box-shadow: none;
}
.input-group .btn:hover {
  background-color: inherit;
  border-color: rgba(27,31,35,0.2);
}

/*attach*/
.post-section  .gallery figure,
.post-section .gallery .card {
  position: relative;
}

.post-section .gallery figcaption,
.post-section .gallery .card-img-overlay  {
  opacity: 0;
  position: absolute;
  top:0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  word-break: break-all;
  cursor: pointer;
  transition-timing-function: ease-in;
  transition-duration: .3s;
  transition-property: all;
  transition-delay: 0s;
}

.post-section .gallery figcaption {
    color: #fff;
}

.post-section .gallery .card-img-overlay:hover,
.post-section .gallery figcaption:hover {
  opacity: 1 !important;
  -webkit-transform: translate(0, 0);
  -ms-transform: translate(0, 0);
  transform: translate(0, 0);
  text-decoration: none;
}

.post-section .gallery .card-img-overlay:hover {
  background-color: #fff !important
}

.post-section .gallery [data-role="caption"] {
  display: none;
}
.post-section .clearfix .float-left:first-child {
  margin-right: 10px
}

.card__corner {
  position: absolute;
  top: 0;
  right: 0;
  width: 2em;
  height: 2em;
  background-color: #e6e7e8;
  border: 1px solid rgba(0,0,0,.045);
  border-top: 0;
}
.card .card__corner {
  top: -1px;
  right: -1px;
}

.card__corner .card__corner-triangle {
  position: absolute;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 2em 2em 0;
  border-color: transparent #fff transparent transparent;
}

.post-section .gallery .card:hover .card__corner,
.post-section .gallery figure:hover .card__corner {
  display: none
}

/* 보기 */
.serial {
  counter-increment: Serial;
}
.serial .counter:before {
  content: counter(Serial);
}
.serial.active .counter:before {
    content: '▶';
}

[data-role="follow"].active {
  background-color: #e0e0e0 !important;
  color: #696969 !important;
  border: none !important
}
[data-role="follow"].active::after {
  content: '중'
}

/* 쓰기 */
.rb-post-write header {
  position: fixed;
  top: 0;
  left: 0;
  right:0;
  bottom:auto
}

.rb-post-write aside {
  position: fixed;
  top: 64px;
  bottom: 0;
  right:0;
  left: auto;
  width: 350px;
  z-index: 99
}

.rb-post-write aside .inner {
  position: relative;
  height: 100%
}

.rb-post-write aside .nav-tabs {
  position: absolute;
  top: 0;
  left:0;
  right:0
}

.rb-post-write aside .tab-content {
  position: absolute;
  top: 40px;
  left: 0;
  right:0;
  bottom:0;
  overflow-x: hidden;
  overflow-y: auto;
}

.nav-tabs .nav-link {
  border: 1px solid transparent;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
  color: #999;
  background-color: rgba(0,0,0,.03);
}
.nav-tabs .nav-item.show .nav-link,
.nav-tabs .nav-link.active {
  color: #495057;
  background-color: #fff;
  border-color: #fff #dee2e6 #fff;
}

.nav-tabs .nav-item:first-child.show .nav-link,
.nav-tabs .nav-item:first-child .nav-link.active {
  border-color: #fff #dee2e6 #fff #fff;
}

.nav-tabs .nav-link:focus,
.nav-tabs .nav-link:hover {
  border-top-left-radius: 0;
  border-top-right-radius: 0;
}

.nav-tabs .nav-link.disabled {
  color: #ccc;
  background-color: rgba(0,0,0,.03);
}

.document-editor {
  position: absolute;
  top: 104px;
  right: 350px;
  bottom: 0;
  left: 0;
  overflow: auto;
}
.document-editor__toolbar {
  position: fixed;
  top: 64px;
  right: 350px;
  left: 0;
}

.rb-post-write [name="subject"] {
  border-color: #fff;
  color: #000;
  font-size: 18px;
  height: calc(1.5em + .5rem + 2px);
  padding: .3rem .5rem;
  font-size: 18px;
  line-height: 1.5;
}
.rb-post-write [name="subject"]:hover {
  border-color: #ced4da
}

.rb-post-write fieldset:disabled button {
  opacity: 0
}

/* 관리 */
.modal .nav-tabs .nav-link {
  border: 1px solid transparent;
  color: #999;
  background-color: transparent;
}
.modal .nav-tabs .nav-item.show .nav-link,
.modal .nav-tabs .nav-link.active {
  color: #495057;
  background-color: #fff;
  border-color: #dee2e6 #dee2e6 #fff;
}