#container{
    position: absolute;
    top: 50%;
    left: 50%;
    margin-right: -50%;
    transform: translate(-50%, -50%);
    min-width: 50vw;
    min-height: 50vh;
    border: 2px solid red;
}

.oneOfFour{
    display: inline;
    min-width: 2%;
    min-height: 1%;
    border: 2px solid red;
    margin: 5px;
}