.radio-btns {
    display: grid;
    gap: 4px;
    grid-template-columns: repeat(3, 100px);
}

.radio-btns:hover .radio-btns__btn:not(:hover) {
    filter: grayscale(100%);
}

.radio-btns:hover .radio-btns__btn:not(:hover)::after {
    background-color: rgba(0, 0, 0, 0.5);
}

@media (min-width: 30rem) {
    .radio-btns {
        grid-template-columns: repeat(3, 150px);
    }
}

.radio-btns__btn {
    position: relative;
    cursor: pointer;
    transition: 0.3s;
}

.radio-btns__btn::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0);
    transition: 0.3s;
}

.radio-btns__btn img {
    display: block;
    width: 100%;
    max-width: 100%;
    height: 100%;
    object-fit: cover;
}

body {
    padding: 1em;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}