* {
    box-sizing: border-box;
}

img {
    max-width: 100%;
}

body {
    margin:0;
    overflow: hidden;
    background-image: url(bluesky.jpg);
}

.container {
    height: 100vh;
    display: flex;
    justify-content: space-evenly;
    align-items: center;
}


.mover {
    background-image: url(birb.png);
    background-size: contain;
    background-repeat: no-repeat;
    width: 150px;
    height: 150px;
    position: absolute;
    bottom: 250px;
    left: 0;
    animation: move 6s infinite linear;
}

@keyframes move {
    0% {
        left:-100px;
    }
    100% {
        left:100%
    }
}

.plane {
    background-image: url(plane.png);
    background-size: contain;
    background-repeat: no-repeat;
    width: 300px;
    height: 300px;
    position: absolute;
    bottom: 500px;
    left: 0;
    animation: move 2s infinite linear;
}

@keyframes move {
    0% {
        left:-100px;
    }
    100% {
        left:100%
    }
}

.face {
    background-image: url(face.png);
    background-size: contain;
    background-repeat: no-repeat;
    width: 1000px;
    height: 1000px;
    position: absolute;
    bottom: -300px;
    left: 100%;
    animation: moveLeft 18s infinite linear;
    opacity: 0.3;
}

@keyframes moveLeft {
    0% {
        left: 100%;
    }
    100% {
        left:-100%
    }
}