body {
    background: #2c3030;
    color: #fff;
}

.rectangle {
    background: #f3e7e7;
    width: auto;
    min-height: 100px;
    border-radius: 5px;
    position: absolute;
    left: 50%;
    position: fixed;
    right: 50px;
    bottom: 100px;
}

.rectangle__circle {
    width: 100px;
    height: 100px;
    background: #ff0000;
    border-radius: 50%;
    position: relative;
    left: 100px;
    top: -50px;
}