.parallax {
    display: flex;
    height: 100vh;
    position: relative;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

#leaf {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 2;
}

#hill1, #hill2, #hill3, #hill4, #hill5, #tree, #plant {
    position: absolute;
    width: 100%;
    bottom: 0;
    left: 0;
}

#text {
    color: #fff;
    font-size: 5vw;
    position: absolute;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, .2);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}