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- .trans{
- transition: transform .2s ease;
- }
- @size: 40px;
- .trigger-btn{
- padding: 6px;
- width: @size;
- height: @size;
- display: inline-block;
- text-align: center;
- color: #5c6b77;
- i{
- .trans;
- vertical-align: top;
- }
- &.collapsed i{
- transform: rotateZ(90deg);
- .trans;
- }
- }
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