console 命令行工具 X clear

console

<div class="arrow">
</div>

.arrow{
    margin-left: 100px;
    margin-top: 100px;
    width: 2rem;
    height: 2rem;
    border-top: 1rem solid #333;
    border-right: 1rem solid #333;
    transform: rotate(-135deg);
}