.gradient {
background: linear-gradient(90deg, #ff0000 0%, #0000ff 100%);
}
.gradient {
/* Fallback para navegadores antiguos */
background: #ff0000;
/* Chrome 10-25, Safari 5.1-6 */
background: -webkit-linear-gradient(left, #ff0000 0%, #0000ff 100%);
/* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
background: linear-gradient(to right, #ff0000 0%, #0000ff 100%);
}