* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Helvetica, Arial, sans-serif;
}

.no-select {
    -webkit-touch-callout: none;
    /* Ios Safari */
    -webkit-user-select: none;
    /* Safari */
    -khtml-user-select: none;
    /* konqueror HTML */
    -moz-user-select: none;
    /* old versions of firefox */
    -ms-user-select: none;
    /* internet Explorer/edge */
    user-select: none;
    /* chrome,edge,opera and firefox */
}

section {
    width: 100%;
    height: 100vh;
    position: relative;
}

section.main {
    display: flex;
    align-items: center;
    justify-content: center;
}

section.main.heaven {
    background: #2980b9;
    background: -webkit-linear-gradient(to right, #ffffff, #6dd5fa, #2980b9);
    background: linear-gradient(to right, #ffffff, #6dd5fa, #2980b9);
}
section.main.hell {
    background: #50021c;
    background: -webkit-linear-gradient(to right, #ffffff, #f11a61, #50021c);
    background: linear-gradient(to right, #ffffff, #f11a61, #50021c);
}

section.main:after {
    content: '';
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 50%;
}

section.main.heaven:after {
    background: transparent;
    background: -webkit-linear-gradient(to top, #2980b9, transparent);
    background: linear-gradient(to top, #2980b9, transparent);
}

section.main.hell:after {
    background: transparent;
    background: -webkit-linear-gradient(to top, #50021c, transparent);
    background: linear-gradient(to top, #50021c, transparent);
}

section.main .mode {
    cursor: pointer;
    position: fixed;
    top: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    border: none;
    outline: none;
    border-radius: 50%;
}
section.main.heaven .mode{
    background-color: black;
}
.title {
    font-size: 12rem;
    letter-spacing: -6px;
    position: relative;
    top: -36px;
}
section.main.heaven .title{
    color: #ffffff;
}
section .clouds {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
}

section .clouds img {
    position: absolute;
    bottom: 0;
    max-width: 100%;
    animation: clouds calc(3s * var(--i)) linear infinite;
}

@keyframes clouds {
    0% {
        opacity: 0;
        transform: scale(1);
    }

    25% {
        opacity: 1;
    }

    90% {
        opacity: 1;
        transform: scale(4);
    }

    100% {
        opacity: 0;
        transform: scale(4);
    }
}