*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.circle{
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background-color: blueviolet;
    text-align: center;
    align-content: center;
    font-weight: bolder;

}
.circle.square {
    border-radius: unset;
}