#cadre_montagne {
    --montagne: #bba;
    overflow: hidden;
    padding: 0;
    margin-top: 110px;
}

#soleil {
    background-image: radial-gradient(white, yellow 10%, transparent 50%);
    height: 60px;
    width: 60px;
    position: relative;
    left: 400px;
    animation-name: soleil;
    animation-duration: 15s;
    animation-iteration-count: infinite;
    animation-timing-function: linear;
    transform-origin: 0px 300px;
}


main {
    overflow: hidden;
    width: 1000px;
}

#ciel {
    background: cornflowerblue;
    height: 200px;
    animation-name: ciel;
    animation-duration: 15s;
    animation-iteration-count: infinite;
    animation-timing-function: linear;
}

#terre {
    background: var(--montagne);
    height: 50px;
    display: flex;
}

.montagne {
    height: 200px;
    width: 200px;
    background: var(--montagne);
}

.montagne:first-child {
    transform: skewX(10deg) scale(1.4, 1) rotate(45deg) translate(-50px, -130px);
    background-image: radial-gradient(circle at top left, white, transparent 30%);
}

.montagne:nth-child(2) {
    transform: rotate(45deg) translate(0, -100px);
    background-image: radial-gradient(circle at top left, white, var(--montagne) 20%);
}

.montagne:nth-child(3) {
    background-image: radial-gradient(circle at top left, #fff 5%, var(--montagne) 30%);
    transform: scale(1.7, 1.2) rotate(45deg) translate(-10px, -100px);
}

.montagne:nth-child(4) {
    transform: skewX(20deg) rotate(45deg) translate(0, -100px);
    background-image: radial-gradient(circle at top left, white, var(--montagne) 20%);
}

.montagne:nth-child(5) {
    transform: skewX(-10deg) scale(1.7, 1) rotate(45deg) translate(-40px, -50px);
    background-image: radial-gradient(circle at top left, #fff, var(--montagne) 20%);
}


@keyframes soleil {
    0% {
        transform: rotate(-90deg);
    }

    100% {
        transform: rotate(90deg);
    }
}

@keyframes ciel {
    0% {
        background-color: black;
    }

    20% {
        background-color: #648;
    }

    40% {
        background-color: cornflowerblue;
    }

    60% {
        background-color: cornflowerblue;
    }

    80% {
        background-color: #648;
    }

    100% {
        background-color: black;
    }
}