html, body {
    overflow: hidden;
    padding: 0;
    margin: 0;
    background: #000;
}
.container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
}
canvas {
    position: absolute;
    top: 0;
    left: 0;
    display: block;
}

.heart {
    position: fixed;
    top: 10%;
    left: 50%;
    transform: translateX(-50%);
    font-size: 10vw;
    line-height: 1;
    user-select: none;
    pointer-events: none;
}

.hint {
    position: fixed;
    bottom: 8%;
    left: 50%;
    transform: translateX(-50%);
    color: #fff;
    text-align: center;
    font-size: 4vw;
    text-shadow: 0 0 5px #000000;
    user-select: none;
    opacity: 0.8;
    transition: opacity 0.4s ease;
}

.hint.hidden {
    opacity: 0;
}

@media all and (min-width: 640px) {
    .heart { font-size: 64px; }
    .hint { font-size: 24px; }
}
.clean-btn {
    z-index: 1;
    font-family: sans-serif;
    font-size: 15px;
    color: white;
    text-shadow: 0 0 10px #000000;
    user-select: none;
    padding: 0 0 15px 25px;
    cursor: pointer;
    text-decoration: underline;
    opacity: .5;
}
.name {
    position: fixed;
    top: 50%;
    left: 50%;
    width: 100%;
    transform: translate(-50%, -50%);
    color: white;
    text-align: center;
    font-size: 4vw;
    text-shadow: 0 0 5px #000000;
    user-select: none;
    pointer-events: none;
}

@media all and (min-width: 640px) {
    .name {
        font-size: 45px
    }
}