css 写 >箭头

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.area-input {       position: relative;         .at-input__container::after {         content: "";         height: 18px;         width: 18px;         top: 36px;         right: 30px;         border-width: 2px 2px 0 0;         border-color: #CCCCCC;         border-style: solid;         transform: matrix(0.71, 0.71, -0.71, 0.71, 0, 0);         position: absolute;       }     }