#description {
    max-width: 90vw;
    width: 320px;
    margin: 0 auto 10px auto;
}

#playGround {
    width: 90vw;
    max-width: 320px;
    height: 90vw;
    max-height: 320px;
    background-color: lightgray;
    border: 2px solid black;
    overflow-y: hidden;
    align-items: center;
    display: flex;
    justify-content: center;
    margin: 0 auto 10px auto;
    position: relative;
}

.squareBox,
.circleBox {
    width: 28vw;
    height: 28vw;
    max-width: 100px;
    max-height: 100px;
    min-width: 48px;
    min-height: 48px;
    background-color: black;
    margin: 4vw;
    display: inline-block;
}

.circleBox {
    border-radius: 50%;
}

button {
    margin: 8px 4px;
    font-size: 1rem;
    min-width: 90px;
    min-height: 40px;
    border-radius: 6px;
}

.center-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.squareBox,
.circleBox,
button {
    touch-action: manipulation;
}

@media (max-width: 400px) {

    #playGround,
    #description {
        max-width: 98vw;
        width: 98vw;
    }

    .squareBox,
    .circleBox {
        width: 38vw;
        height: 38vw;
        min-width: 32px;
        min-height: 32px;
    }
}