bootstrap circle background code example
Example 1: css circle
#circle {
width: 100px;
height: 100px;
background: red;
border-radius: 50%
}
Example 2: how to make a circle in html
<svg xmlns="http://www.w3.org/2000/svg">
<circle cx="50" cy="50" r="50" fill="red" />
</svg>