console 命令行工具 X clear

console

<div class="triangle">
</div>

<div class="triangle copy">
</div>

.triangle{
    margin: 0 auto;
    display: block;
    height: 0px;
    width: 0px;
}
.triangle{
    border-top: 50px solid transparent;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    border-bottom: 50px solid green;
}

.copy{
    margin-top: 100px;
    transform: rotate(180deg);
}