* {
    background: #000;
    color: azure;
    font-size: 2vw;
    }

.content {
    min-height: 400vh;
}
.quadro {
    background: #ffffff;
    height: 100px;
    margin-top: 220px;
    border-radius: 15px;
    position: fixed;
    left: 50%;
    right: 50px;
    bottom: 100px;
}

.rad {
    height: 100px;
    width: 100px;
    border-radius: 100px;
    background: #ff0000;
    position: fixed;
    bottom: 150px;
    left: 55%;
}