.topnav {
    overflow: hidden;
    position: absolute;
    margin: 20px;
    width: auto;
}

.topnav a {
    float: left;
    color: #f2f2f2;
    text-align: center;
    padding: 8px 8px;
    text-decoration: none;
    font-size: 12px;
}

.topnav a:hover {
    background-color: #ddd;
    color: goldenrod;
}

.topnav a.active {
    color: white;
}

.topnav a.active:hover {
    background-color: #ddd;
    color: rgb(219, 166, 32);
}

body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-content: center;
    background: goldenrod;
}

.gallery {
    --s: 130px;
    display: grid;
    grid-template-columns: repeat(3, auto);
    gap: 5px;
    position: relative;
}

.gallery input {
    position: absolute;
    border: 2px solid #000;
    border-radius: 50%;
    inset: calc(50% - var(--s)/3);
    cursor: pointer;
    --g: linear-gradient(#000 0 0) no-repeat;
    background: var(--g) 50%/var(--b,0%) 3px, var(--g) 50%/3px var(--b,0%);
    transition: 1.5s;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}

.gallery > img {
    width: var(--s);
    aspect-ratio: 1;
    object-fit: cover;
    transform: scale(.1);
    filter: brightness(0);
    pointer-events: none;
    transform-origin: var(--x) var(--y);
    transition: 1s calc((var(--i) - 1)*.1s);
}

.gallery > img:nth-of-type(1) { --i:1; --x:150%; --y:150%; }
.gallery > img:nth-of-type(2) { --i:2; --x: 50%; --y:150%; }
.gallery > img:nth-of-type(3) { --i:3; --x:-50%; --y:150%; }
.gallery > img:nth-of-type(4) { --i:4; --x:150%; --y: 50%; }
.gallery > img:nth-of-type(5) { --i:5; }
.gallery > img:nth-of-type(6) { --i:6; --x:-50%; --y: 50%; }
.gallery > img:nth-of-type(7) { --i:7; --x:150%; --y:-50%; }
.gallery > img:nth-of-type(8) { --i:8; --x: 50%; --y:-50%; }
.gallery > img:nth-of-type(9) { --i:9; --x:-50%; --y:-50%; }

.gallery > input:checked ~ img {
    transform: scale(1);
    filter: brightness(1);
    pointer-events: initial;
}

.gallery > input:checked {
    transform: translateY(calc(1.75*var(--s))) scale(.5) rotate(45deg);
    --b: 70%;
}