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.arrow-up {
    display: inline-block;
    content: "";
    width: 0; 
    height: 0; 
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-bottom: 5px solid black;
}

.arrow-down {
    display: inline-block;
    content: "";
    width: 0; 
    height: 0; 
    border-left: 20px solid transparent;
    border-right: 20px solid transparent;
    border-top: 20px solid #f00;
}

.arrow-right {
    display: inline-block;
    content: "";
    width: 0; 
    height: 0; 
    border-top: 60px solid transparent;
    border-bottom: 60px solid transparent;
    border-left: 60px solid green;
}

.arrow-left {
    display: inline-block;
    content: "";
    width: 0; 
    height: 0; 
    border-top: 10px solid transparent;
    border-bottom: 10px solid transparent; 
    border-right:10px solid blue; 
}