:root {
    --purple: #543864;
    --purple-dark: #452a55;
    --orange: #ff6363;
    --orange-light: #f8a488;
    --orange-dark: rgb(224, 136, 107);
    --yellow: #ffbd69;
    --green: #edffa9;
    --pink: #eca3f5;
    --bg: #f8f5f1;
}
main {
    min-height: 80vh;
}
main section {
    width: clamp(300px - 2rem, 80vw, 800px);
    height: calc((clamp(300px - 2rem, 80vw, 800px) - 60px) / 3);
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    padding: 0;
    gap: 30px;
}
header h2{
    padding: 0 1rem;
}
footer a,footer p{
    color: #fff;
}
footer a{
    text-decoration: underline;
}
.algo a {
    position: relative;
    border-radius: 4px;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
    font-size: 3rem;
    text-decoration: none;
    color: #fff;
    transition: all 0.3s linear;
    overflow: hidden;
    background-color: var(--orange-light);
}

.two a {
    background-color: var(--purple);
}
.two a::after,
.two a::before {
    background-color: var(--purple-dark);
}
.one a::after,
.one a::before,
.three a::after,
.three a::before {
    background-color: var(--orange-dark);
}
.algo a:hover {
    border: 10px solid white;
    box-shadow: 0 10px 6px -5px hsl(0, 0%, 77%);
}
.one a::before {
    content: "BFS";
}
.two a::before {
    content: "A Star";
}
.three a::before {
    content: "DFS";
}
.one a::after {
    content: "Breadth First Search Traversal of graph";
}
.two a::after {
    content: "A Star Path finding algorithm";
}
.three a::after {
    content: "Depth First Search Traversal of graph";
}
.algo a::after,
.algo a::before {
    position: absolute;
    text-align: center;
    padding: 0.5rem;
    width: calc(100% - 1rem);
    left: 0;
    font-size: 1rem;
    transition: transform ease 0.3s;
}
.algo a::before {
    height: 20%;
    top: 0;
    transform: translateY(-100%);
}

.algo a::after {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 80%;
    transform: translateY(100%);
    top: 20%;
}
.algo a:hover::before,
.algo a:hover::after {
    transform: translateY(0);
}
@media only screen and (max-width: 650px) {
    main section {
        grid-template-columns: 1fr;
        width: clamp(200px - 2rem, 50vw, 800px);
        height: calc(clamp(200px - 2rem, 50vw, 800px) * 3);
    }
}