CloudInvaders/css/style.css

html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgb(51, 51, 51);
    overflow: hidden;
    white-space: nowrap;
    color: white;
    font-family: arial;
}

#root, #canvas {
    position: absolute;
    margin: 0;
    padding: 0;
    width: 100%;
    max-height: 100%;
    aspect-ratio: 16/9;
    overflow: hidden;
}

#canvas {
    background: rgb(31, 31, 31);
}

#root div {
    transform: translate(-50%, -50%);
    position: absolute;
}

.cloud-particle {
    border-radius: 50%;
    background: rgb(255, 255, 255);
    animation-name: cloud;
    animation-iteration-count: infinite;
    animation-direction: alternate;
}

.result {
    left: 50%;
    top: 50%;
    font-size: 108px;
}

.result:after {
    content: 'Press any key to continue';
    position: absolute;
    font-size: 48px;
    width: fit-content;
    top: 85%;
    left: 50%;
    transform: translate(-50%);
}

#lives {
    position: absolute;
    top: 15px;
    left: 15px;
    font-size: 32px;
}

#sound {
    position: absolute;
    display: block;
    top: 15px;
    right: 15px;
    font-size: 32px;
    border: none;
    background: transparent;
    outline: none;
    cursor: pointer;
}

#lives:before {
    content: '❤ ';
    color: red;
}

@keyframes cloud {
    from {
        transform: translate(-50%) scale(1.2);
        opacity: 0.7;
    }

    to {
        transform: translate(-50%) scale(0.2);
        opacity: 0.1;
    }
}