css drawing special graphics basics

.isosceles{
    width: 0;
    height: 0;
    border:30px solid;
    border-left-color: transparent;
    border-right-color: transparent;
    border-top-color: transparent;
    border-bottom-color: red;
}

.right{
    width: 0;
    height: 0;
    border:30px solid;
    border-left: 0;
    border-right-color: transparent;
    border-top: 0;
    border-bottom-color: red;
}

.round{
    width: 100px;
    height: 100px;
    background-color: red;
    border-radius:50%;   
}

.ellipse{
    width: 100px;
    height: 80px;
    background-color: red;
    border-radius:50%;   
}