styles.css

body {
    display: flex;
    flex-direction: column;
    align-items: center; 
    font-family: 'Montserrat', sans-serif;
    margin-bottom: 3rem;
}
h1 {
    color: #333;
    font-size: 1.5rem;
    margin: 3rem 0 .5rem;
}
#fecha {
    margin-bottom: 2rem;
    color: #999;
}
#resultados {
    width: 90vw;
    max-width: 1024px;
    min-height: 65vh;
    display: grid;
    grid-gap: 1rem;
    justify-content: center;
    align-content: center;
}
@media screen and (min-width: 601px) {
    #resultados {
        grid-template-columns: 24% 24% 24% 24%;
    }
}
@media screen and (max-width: 600px) {
    #resultados {
        grid-template-columns: 45% 45%;
    }
}
.card {
    font-size: 90%;
    transition: all .35s ease;
    border: 1px solid #eee;
    border-radius: .5rem;
    box-shadow: 0 2px 25px rgba(0,0,0,.15);
    justify-content: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
}
.card:hover{
    box-shadow: 0 5px 50px rgba(0,0,0,.25);;
}
.card div {
    padding: 0 1rem;
}
.card img {
    margin: 1rem;
    margin-bottom: .5rem;
}
.card .titulo{
    font-size: 100%;
    margin-bottom: .5rem;
}
.card .precio-ant {
    display: flex;
}
.card .precio {
    font-size: small;
    text-decoration: line-through; 
    color: grey;
}
.card .dcto {
    white-space: nowrap;
    font-size: small;
    color: green;
}
.card .oferta {
    font-size: 150%;
    margin: .5rem 0;
}
#cargando {
    margin-top: -10vh;
    height:20vh;
    width: 400%;
    background: transparent url(https://loading.io/spinners/balls/lg.circle-slack-loading-icon.gif) no-repeat center center;
    background-size: contain;
}
.pie {
    font-size: .9rem;
    margin-top: 5rem;
    color: #999;
}
.by {
    font-size: .9rem;
    color: #ccc;
}