/* body {
    overflow: hidden;
} */

.section1 {
    display: flex;
    justify-content: center;
    align-items: center;
    /* min-height: 100vh; */
    max-height: 100%;
    /* background: #034071; */
    overflow: hidden;
}

.section1 .runway {
    position: relative;
    width: 500px;
    height: 70%;
    background: #1378bc;
    border-left: 20px solid rgba(0,0,0,0.25);
    border-right: 20px solid rgba(0,0,0,0.25);
    transition: transform 1s;
    transition-delay: 1s;
    transform-origin: top;
}

/* plane fly on click left + hold */
/* plane land when relese left click */

.section1:active  .runway{
    transform: scaleX(0.7) scaleY(0);
    transition-delay: 0s;
    transform-origin: bottom;
}

.section1 .runway::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 100%;
    background: repeating-linear-gradient(transparent 0%, transparent 50%, #fff 50%, #fff 100%);
    background-size: 20px 320px;
    animation: animateRunway 0.5s linear infinite;
}

/* add effect on 'left click on hold' */
.section1:active .runway::before {
    animation: animateRunway 0.25s linear infinite;
}

@keyframes animateRunway {
    0%{
        background-position-y: 0px;
    }
    100% {
        background-position-y: 640px;
    }
}

.plane {
    position: absolute;
    bottom: 100px;
    width: 50px;
    max-width: 250px;
    pointer-events: none;
    filter: drop-shadow(10px 10px 0 rgba(0,0,0,0.5));
    transition: 5s;
}

.section1:active .plane {
    max-width: 500px;
    filter: drop-shadow(200px 200px 0 rgba(0,0,0,0));
}

.clouds {
    position: absolute;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 100000;
    pointer-events: none;
    opacity: 0;
    transition: opacity 2s;
    transition-delay: 0s;
}

.section1:active .clouds {
    opacity: 1;
    transition-delay: 1s;
}

.clouds img {
    position: absolute;
    left: 0;
    width: 800px;
    animation: animateClouds 4s linear infinite;
    animation-delay: calc(-1.5s * var(--i));
}

.clouds2 {
    right: 0;
    transform: rotate(180deg);
}

.clouds2 img {
    animation: animateClouds2 4s linear infinite;
    animation-delay: calc(-1.5s * var(--i));
}

@keyframes animateClouds {
    0% {
        transform: translateY(-100%);
    }
    100% {
        transform: translateY(100%);
    }
}

@keyframes animateClouds2 {
    0% {
        transform: translateY(100%);
    }
    100% {
        transform: translateY(-100%);
    }
}