#cover {
    background-color: whitesmoke;
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0px;
    left: 0px;
    z-index: 100;
}
.hidden {
    visibility: hidden;
    opacity: 0;
    transition: visibility 0s 1.5s, opacity 1.5s linear;
}
#title {
    font: 120px helvetica;
    font-weight: lighter;
    transition: all 0.5s ease;
}
.square {
    transition: all 0.25s ease-out;
    display: inline-block;
    margin: 10px;
    height: 50px;
    width: 50px;
    cursor: pointer;
}
.square:hover {
    transition: all 0s;
}
.square.sweep {
    transition: all 0.5s ease;
    cursor: auto;
}

#title, #wrapper {
    display: flex;
    width: 100%;
    height: 100%;
    justify-content: center;
    align-items: center;
}