#maincontainer {
    box-shadow: rgba(100, 100, 111, 0.2) 0px 7px 29px 0px;
    padding: 2rem;
    margin-top: 2rem;
    border-radius: 1rem;
}

.selector {
    position: absolute;
    width: 50%;
    margin-left: 25%;
    margin-right: 25%;
}