style.css

* {
    box-sizing: border-box;
    padding: 0;
    margin: 0;
}
body {
    background-color: #f6f6f3;
    font-family: 'Open Sans', sans-serif;
}
a {
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}
.contenedor {
    max-width: 1000px;
    width: 90%;
    margin: 0 auto;
}
.contenedor__cards {
    margin: 70px 0;
}
.card {
    background-color: #FFF;
    border-radius: 15px;
    padding: 20px;
    display: flex;
    position: relative;
    margin-bottom: 50px;
    flex-direction: column;
    align-items: center;
}
.card__thumbnail {
    width: 100%;
    max-width: 290px;
    border-radius: 10px;
    overflow: hidden;
    display: inline-block;
}
.card__img {
    width: 100%;
}
.card__titulo {
    font-family: 'Raleway', sans-serif;
    font-size: 30px;
    font-weight: normal;
    margin-bottom: 20px;
}
.card__enlace-titulo {
    color: #000;
}
.card__extracto {
    line-height: 28px;
    color: #6d6d6d;
    margin-bottom: 20px;
}

.boton {
    border: none;
    min-width: 180px;
    height: 50px;
    padding: 0 30px;
    background-color: #000;
    color: #FFF;
    display: inline-block;
    border-radius: 100px;
    text-decoration: none;
    display: inline-flex;
    justify-content:space-between ;
    align-items: center;
    background-color: #403CC2;
    transition: .3s ease all;
}
.boton__texto {
    font-weight: 600;
}
.boton:hover {
    background-color: #1B1881;
    text-decoration: none;
}
.boton--absolute {
    position: absolute;
    right: 20px;
    bottom: -25px;
}
.boton--verde {
    background-color: #7BA771;
}
.boton--verde:hover {
    background-color: #437837;
}

.frase {
    text-align: center;
    margin: 70px 0;
}
.frase__texto {
    margin-bottom: 20px;
    font-size: 30px;
    font-family: 'Raleway', sans-serif;
    font-weight: 600;
    font-style: italic;
}

@media (min-width:800px) {
    .card {
        flex-direction: row;
    }
    .card__thumbnail {
        margin-right: 20px;
    }
}