.header {
    text-align: center ;
    background: #1C1C1C;
    color: white;
    padding: 20px;
    margin-bottom: 20px;
}

h2 {
    padding: 10px;
    text-align: center;
}

.grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    padding: 20px;
}

.grid {
    height: 250px;
}
body{
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}
.caja {
    height: 150px;
    border-radius: 12px;
    text-decoration: none;
    color: black;
    cursor: pointer;
    border: 2px solid black;
    font-weight: bold;
    font-size: 20px;
    text-align: center;
	  display: inline-flex;
    justify-content: center;
    align-items: center;
}
.caja:nth-child(1) {
    background-color: yellow;
}
.caja:nth-child(2) {
    background-color: red;
}

.caja:nth-child(3) {
    background-color: pink;
}

.caja:nth-child(4) {
    background-color: aquamarine;
}

.caja:nth-child(5) {
    background-color: green;
}

.caja:nth-child(6) {
    background-color: coral;
}

.caja:nth-child(7) {
    background-color: mediumpurple;
}
.footer {
    background: #1C1C1C;
    color:white;
    text-align: center;
    padding: 12px;
    font-size: 14px;
    position: fixed;
    left: 0px;
    bottom: 0px;
    width: 100%;
}