html,
body {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center
}

.container2 {
    --duration: 1.5s;
    --container-size: 250px;
    --box-size: 33px;
    --box-border-radius: 15%;
    width: var(--container-size);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative
}

.container2 .📦 {
    width: var(--box-size);
    height: var(--box-size);
    position: relative;
    display: block;
    transform-origin: -50% center;
    border-radius: var(--box-border-radius)
}

.container2 .📦:after {
    content: '';
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    right: 0;
    background-color: #add8e6;
    border-radius: var(--box-border-radius);
    box-shadow: 0 0 10px 0 rgba(28, 159, 255, .4)
}

.container2 .📦:nth-child(1) {
    animation: slide var(--duration) ease-in-out infinite alternate
}

.container2 .📦:nth-child(1):after {
    animation: color-change var(--duration) ease-in-out infinite alternate
}

.container2 .📦:nth-child(2) {
    animation: flip-1 var(--duration) ease-in-out infinite alternate
}

.container2 .📦:nth-child(2):after {
    animation: squidge-1 var(--duration) ease-in-out infinite alternate
}

.container2 .📦:nth-child(3) {
    animation: flip-2 var(--duration) ease-in-out infinite alternate
}

.container2 .📦:nth-child(3):after {
    animation: squidge-2 var(--duration) ease-in-out infinite alternate
}

.container2 .📦:nth-child(4) {
    animation: flip-3 var(--duration) ease-in-out infinite alternate
}

.container2 .📦:nth-child(4):after {
    animation: squidge-3 var(--duration) ease-in-out infinite alternate
}

.container2 .📦:nth-child(5) {
    animation: flip-4 var(--duration) ease-in-out infinite alternate
}

.container2 .📦:nth-child(5):after {
    animation: squidge-4 var(--duration) ease-in-out infinite alternate
}

.container2 .📦:nth-child(2):after {
    background-color: #1c9fff
}

.container2 .📦:nth-child(3):after {
    background-color: #1fb1fd
}

.container2 .📦:nth-child(4):after {
    background-color: #22c7fb
}

.container2 .📦:nth-child(5):after {
    background-color: #23d3fb
}

@keyframes slide {
    0% {
        background-color: #1795ff;
        transform: translatex(0vw)
    }
    100% {
        background-color: #23d3fb;
        transform: translatex(calc(var(--container-size) - (var(--box-size) * 1.25)))
    }
}

@keyframes color-change {
    0% {
        background-color: #1795ff
    }
    100% {
        background-color: #23d3fb
    }
}

@keyframes flip-1 {
    0%,
    15% {
        transform: rotate(0)
    }
    35%,
    100% {
        transform: rotate(-180deg)
    }
}

@keyframes squidge-1 {
    5% {
        transform-origin: center bottom;
        transform: scalex(1) scaley(1)
    }
    15% {
        transform-origin: center bottom;
        transform: scalex(1.3) scaley(.7)
    }
    25%,
    20% {
        transform-origin: center bottom;
        transform: scalex(.8) scaley(1.4)
    }
    55%,
    100% {
        transform-origin: center top;
        transform: scalex(1) scaley(1)
    }
    40% {
        transform-origin: center top;
        transform: scalex(1.3) scaley(.7)
    }
}

@keyframes flip-2 {
    0%,
    30% {
        transform: rotate(0)
    }
    50%,
    100% {
        transform: rotate(-180deg)
    }
}

@keyframes squidge-2 {
    20% {
        transform-origin: center bottom;
        transform: scalex(1) scaley(1)
    }
    30% {
        transform-origin: center bottom;
        transform: scalex(1.3) scaley(.7)
    }
    40%,
    35% {
        transform-origin: center bottom;
        transform: scalex(.8) scaley(1.4)
    }
    70%,
    100% {
        transform-origin: center top;
        transform: scalex(1) scaley(1)
    }
    55% {
        transform-origin: center top;
        transform: scalex(1.3) scaley(.7)
    }
}

@keyframes flip-3 {
    0%,
    45% {
        transform: rotate(0)
    }
    65%,
    100% {
        transform: rotate(-180deg)
    }
}

@keyframes squidge-3 {
    35% {
        transform-origin: center bottom;
        transform: scalex(1) scaley(1)
    }
    45% {
        transform-origin: center bottom;
        transform: scalex(1.3) scaley(.7)
    }
    55%,
    50% {
        transform-origin: center bottom;
        transform: scalex(.8) scaley(1.4)
    }
    85%,
    100% {
        transform-origin: center top;
        transform: scalex(1) scaley(1)
    }
    70% {
        transform-origin: center top;
        transform: scalex(1.3) scaley(.7)
    }
}

@keyframes flip-4 {
    0%,
    60% {
        transform: rotate(0)
    }
    80%,
    100% {
        transform: rotate(-180deg)
    }
}

@keyframes squidge-4 {
    50% {
        transform-origin: center bottom;
        transform: scalex(1) scaley(1)
    }
    60% {
        transform-origin: center bottom;
        transform: scalex(1.3) scaley(.7)
    }
    70%,
    65% {
        transform-origin: center bottom;
        transform: scalex(.8) scaley(1.4)
    }
    100%,
    100% {
        transform-origin: center top;
        transform: scalex(1) scaley(1)
    }
    85% {
        transform-origin: center top;
        transform: scalex(1.3) scaley(.7)
    }
}