.arrow-down {
width: 0;
height: 0;
border-left: 75px solid transparent;
border-right: 75px solid transparent;
border-top: 75px solid #f00;
}.arrow-left {
width: 0;
height: 0;
border-top: 60px solid transparent;
border-bottom: 60px solid transparent;
border-right: 60px solid blue;
}.arrow-up {
width: 0;
height: 0;
border-left: 75px solid transparent;
border-right: 75px solid transparent;
border-bottom: 75px solid #761E9B;
}.arrow-right {
width: 0;
height: 0;
border-top: 60px solid transparent;
border-bottom: 60px solid transparent;
border-left: 60px solid green;
}