body {
    width: 100vw;
    height: 100vh;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: dimgray;
}

#playground {
    height: 60%;
    aspect-ratio: 1;
    background-color: white;
    position: relative;
}

.boundary {
    position: absolute;
    aspect-ratio: 1;
    border: 1px solid blue;
    box-sizing: border-box;
}

.explorer {
    position: absolute;
    aspect-ratio: 1;
    box-sizing: border-box;
    border: 1px solid black;
    border-top: 2px solid red;
}

.marker {
    position: absolute;
    width: 0;
    height: 0;
    display: flex;
    justify-content: center;
    align-items: center;

    &::before,
    &::after {
        content: '';
        position: absolute;
        width: 12px;
        height: 1px;
        background-color: red;
    }

    &::before {
        rotate: 45deg;
    }

    &::after {
        rotate: -45deg;
    }
}

.guess {
    position: absolute;
    border: 1px solid green;
    aspect-ratio: 1;
    box-sizing: border-box;
}

#controls {
    margin-top: 0.8em;

    &>button {
        background-color: white;
        border-radius: 2px;
        border: 1px solid black;
        padding: 0.4em 0.6em;
    }
}