:root {
    --background-color: #333;
    --ball-bottom-offset: -2%;
}

html,
body {
    height: 100%;
}

body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: var(--background-color);
}

.container {
    height: 300px;
    width: 300px;
    position: relative;
}

.scroller {
    height: 100%;
    width: 300%;
    display: flex;
    transition: transform 500ms;
}

.item {
    height: 100%;
    width: 33.3%;
}

.item:nth-of-type(1) {
    background-color: red;
}

.item:nth-of-type(2) {
    background-color: green;
}

.item:nth-of-type(3) {
    background-color: blue;
}

.controls {
    position: absolute;
    display: flex;
    width: 100%;
    justify-content: center;
    bottom: 5%;
}

.control {
    height: 20px;
    width: 20px;
    border-radius: 20px;
    background-color: white;
    margin: 0 10px;
    cursor: pointer;
}

[type='checkbox'] {
    display: none;
}

[type='radio'] {
    display: none;
}

[type='radio'] + label {
    cursor: pointer;
}

label {
    position: relative;
    margin: 0 20px;
}

label::after {
    content: '';
    height: 20px;
    width: 20px;
    border-radius: 20px;
    border: 1px solid white;
    position: absolute;
    top: 0%;
    left: 0%;
}

.radios {
    position: relative;
}

.ball {
    height: 20px;
    width: 20px;
    border-radius: 20px;
    background-color: white;
    position: absolute;
    transform: translateX(100%);
    top: 0%;
    left: 0%;
    transition: all 250ms;
    transform: translate(105%, var(--ball-bottom-offset));
}

[type='radio']:checked
    + label
    + [type='radio']:not(:checked)
    + label
    + [type='radio']:not(:checked)
    + label
    + .ball {
    background-color: green;
    transform: translate(105%, var(--ball-bottom-offset));
}

[type='radio']:not(:checked)
    + label
    + [type='radio']:checked
    + label
    + [type='radio']:not(:checked)
    + label
    + .ball {
    background-color: red;
    transform: translate(412%, var(--ball-bottom-offset));
}

[type='radio']:not(:checked)
    + label
    + [type='radio']:not(:checked)
    + label
    + [type='radio']:checked
    + label
    + .ball {
    background-color: blue;
    transform: translate(722%, var(--ball-bottom-offset));
}