panels_admin.css in Panels 5.2

.layout-link {
  float: left; 
  padding: 1em;
  width: 125px;
  height: 160px;
}

.layout-link img {
  margin-left: auto;
  margin-right: auto;
}

/* general style for the layout-icon */
.layout-icon {
  display: block;
  text-align: center;
}
.layout-icon img {
  display: block;
  margin: 0 auto;
}
.layout-icon .caption {
  width: 90px;
  margin-bottom: 1em;
}

/* styles for the basic panel-%implementation% edit page */
.layout-container,
.right-container {
  float: right;
  padding: 0 0 0 .5em;
  margin: 0;
  width: 48.5%;
}

.info-container,
.left-container {
  padding-right: .5em;
  width: 48.5%;
}

.right-container fieldset,
.left-container fieldset,
.layout-container fieldset {
  margin-top: 0;
}

.layout-container .form-item {
  margin: 0;
}

.layout-container .form-submit {
  margin-top: 1em;
}

.layout-container .layout-icon {
  float: right;
  margin-left: .5em;
}

.content-list ol {
  padding-left: 0;
  list-style-position: inside;
}

.content-list dt {
  font-weight: bold;
}

.content-list dd {
  margin-left: 2em;
}

/* styles for the choose layout page */
#panels-common-set-allowed-layouts .form-checkboxes .form-item,
#panels-choose-layout .form-radios .form-item {
  float: left;
  margin-right: .5em;
  width: 90px;
}

#panels-common-set-allowed-layouts .form-checkboxes .form-item .layout-icon,
#panels-choose-layout .form-radios .form-item .layout-icon {
  float: none;
  height: 15em;
  width: 90px;
}
#panels-common-set-allowed-layouts .form-checkboxes .option,
#panels-choose-layout .form-radios .form-item .option {
  text-align: center;
}
#panels-common-set-allowed-layouts .form-checkboxes .option input,
#panels-choose-layout .form-radios .form-item .option input {
  display: block;
  margin: 0 auto;
}

#panels-common-set-allowed-layouts .form-submit,
#panels-choose-layout .form-submit {
  clear: left;
}

#panels-common-set-allowed-layouts .panels-layout-list label,
#panels-choose-layout .panels-layout-list label {
  width: 300px;
  float: left;
  clear: left;
  background: url(../images/go-right.png) right no-repeat;
  margin-right: 20px;
}

.change-layout-display .layout-icon {
  float: left;
}

.change-layout-display > img {
  padding: 25px 25px 25px 0;
  float: left;
}

#panels-edit-display .panel-pane,
#panels-edit-display .helperclass {
  margin: .5em;
}

#panels-edit-display .inline-icon-help {
  vertical-align: middle;
  margin: 2px 1px;
}

table .operation {
  text-align: right;
  padding-right: 6px;
}

table .argument-operation input {
  padding: 0;
  margin: 0;
  position: relative;
  top: 3px;
}

.panels-admin-view {
  padding: 1em;
  border: 1px dotted black;
  margin-bottom: 1em;
}

tr.changed td {
  background-color: #FFFFDD !important;
}

tr.changed td span.star {
  font-weight: bold;
  color: #E09010;
}