.subject3 {
    width: 220px;
    height: 50px;
    border-radius: 20px;
    background: #454545;
    font-size: 16px;
    font-family: 'Global Monospace';
    font-weight: bold;
    text-align: center;
    line-height: 50px;
    position: fixed;
    left: calc(50% - 110px);
    top: calc(50% - 25px);
    color: #fff;
}