.caret {
        width: 0;
        height: 0;
        display: inline-block;
        border: 10px solid transparent;
    }
    .caret.down{
        border-top-color: black;
    }
    .caret.right{
        border-left-color: black;
    }
    .caret.up{
        border-bottom-color: black;
    }
    .caret.left{
        border-right-color: black;
    }