body {
    background-color: #404456;
}

div {
    -webkit-animation: seconds 1.0s forwards;
    -webkit-animation-iteration-count: 1;
    -webkit-animation-delay: 5s;
    animation: seconds 1.0s forwards;
    animation-iteration-count: 1;
    animation-delay: 5s;
    position: relative;
}

@-webkit-keyframes seconds {
    0% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        left: -9999px;
    }
}

@keyframes seconds {
    0% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        left: -9999px;
    }
}

#loader {
    position: absolute;
    top: 50%;
    left: 50%;
    margin-top: -2.7em;
    margin-left: -2.7em;
    width: 5.4em;
    height: 5.4em;
    background-color: #404456;
}

#hill {
    animation-delay: 5s;
    position: absolute;
    width: 7.1em;
    height: 7.1em;
    top: 1.7em;
    left: 1.7em;
    background-color: transparent;
    border-left: .25em solid whitesmoke;
    transform: rotate(45deg);
}

#hill:after {
    content: '';
    position: absolute;
    width: 7.1em;
    height: 7.1em;
    left: 0;
    background-color: #404456;
}

#box {
    position: absolute;
    left: 0;
    bottom: -.1em;
    width: 1em;
    height: 1em;
    background-color: transparent;
    border: .25em solid whitesmoke;
    border-radius: 15%;
    transform: translate(0, -1em) rotate(-45deg);
    animation: push 2.5s cubic-bezier(.79, 0, .47, .97) infinite;
}

@keyframes push {
    0% {
        transform: translate(0, -1em) rotate(-45deg);
    }
    5% {
        transform: translate(0, -1em) rotate(-50deg);
    }
    20% {
        transform: translate(1em, -2em) rotate(47deg);
    }
    25% {
        transform: translate(1em, -2em) rotate(45deg);
    }
    30% {
        transform: translate(1em, -2em) rotate(40deg);
    }
    45% {
        transform: translate(2em, -3em) rotate(137deg);
    }
    50% {
        transform: translate(2em, -3em) rotate(135deg);
    }
    55% {
        transform: translate(2em, -3em) rotate(130deg);
    }
    70% {
        transform: translate(3em, -4em) rotate(217deg);
    }
    75% {
        transform: translate(3em, -4em) rotate(220deg);
    }
    100% {
        transform: translate(0, -1em) rotate(-225deg);
    }
}