body {
    text-align: center;
    background-color: #011F3F;
    user-select: none;
}

#level-title {
    font-family: "Press Start 2P", cursive;
    font-size: 3rem;
    margin: 5%;
    color: #fef2bf;
    z-index: 2;
    position: relative;
    line-height: 1.5;
}

.container {
    display: block;
    width: 50%;
    margin: auto;
}

.btn {
    margin: 25px;
    display: inline-block;
    vertical-align: top;
    height: 200px;
    width: 200px;
    border: 10px solid #fef2bf;
    border-radius: 20%;
    cursor: pointer;
    position: relative;
}

.btn p {
    margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    width: 100%;
    font-family: "Press Start 2P", cursive;
}

.game-over {
    background-color: red;
    backdrop-filter: grayscale(0%);
}

.overlay-active {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    backdrop-filter: grayscale(70%);
    -webkit-backdrop-filter: grayscale(70%);
    z-index: 1;
}

.marquee {
    margin-top: 3rem;
    width: 80%;
    left: 10%;
    height: 60px;
    border-top: 2px solid rgba(255, 255, 255, 0.2);
    border-bottom: 2px solid rgba(255, 255, 255, 0.2);
    overflow: hidden;
    position: relative;
    display: flex;
    align-items: center;
}

.marquee-track {
    display: flex;
    gap: 1rem;
    white-space: nowrap;
    will-change: transform;
    --start-position: 100%;
}

.history-block {
    width: 30px;
    height: 30px;
    border: 2px solid black;
    flex-shrink: 0;
    box-shadow: 2px 2px 0 rgba(255, 255, 255, 0.5);
    border-radius: 20%;
}

.red-outline {
    outline: 4px solid red;
    outline-offset: 8px;
}

.green-outline {
    outline: 4px solid green;
    outline-offset: 8px;
}

.red {
    background-color: red;
}

.green {
    background-color: green;
}

.blue {
    background-color: blue;
}

.yellow {
    background-color: yellow;
}

.pressed {
    box-shadow: 0 0 20px white;
    background-color: grey;
}

.level-color {
    color: yellow;
}

.black-text {
    color: black;
}

.white-text {
    color: white;
}

.invisible {
    visibility: hidden;
}

@keyframes fly-through {
    0% {
        transform: translateX(var(--start-position));
    }
    100% {
        transform: translateX(-100%);
    }
}