*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body{
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    font-family: sans-serif;
    margin: 2rem;
    background-image: linear-gradient(0.25turn, red, yellow, green);
}

#grid{
    display: grid;
    grid-template-columns: repeat(3, 7rem);
    grid-template-rows: repeat(3, 7rem);
    gap: 1rem;
    margin: 3rem auto;
}

.case{
    border: 1px solid black;
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 3rem;
}

p{
 margin-bottom: 1rem;
 font-size: 1.5rem;   
}

p:first-of-type{
    color: lightseagreen;
}

footer{
    margin-top: 50px;
    font-weight: bolder;
    font-style: italic;
    text-shadow: 5px 5px 5px;
}