body{
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    height: 80vh;
    font-family: Helvetica, sans-serif;
}

footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    text-align: center;
    width: 100%;
    background-color: darkcyan;
}

footer h5 {
    color: whitesmoke;
}

.letras p {
    display: inline-flex;
    color: cadetblue;
    font-size: 40px;
    font-weight: bold;
    padding: 0 4px;
}

p:nth-child(2), p:nth-child(12) {
    animation: gangorra 3s alternate infinite;
}
p:nth-child(3), p:nth-child(11) {
    animation: gangorra 2s alternate infinite;
}
p:nth-child(4), p:nth-child(10) {
    animation: gangorra 4s alternate infinite;
}
p:nth-child(5), p:nth-child(9) {
    animation: gangorra 3s alternate infinite;
}
p:nth-child(6) {
    animation: gangorra 3s alternate infinite;
}
p:nth-child(8) {
    animation: gangorra 4s alternate infinite;
}

@keyframes gangorra {
     0% { transform: translateY(0%); }
    50% { transform: translateY(-50%); }
   100% { transform: translateY(50%); }
}