[CSS] Fundo Gradiente

<style>
div{
  background: red; /* Browser que não suportam gradiente */
  background: -webkit-linear-gradient(left, red , yellow); /* Safari */
  background: -o-linear-gradient(right, red, yellow); /* Opera */
  background: -moz-linear-gradient(right, red, yellow); /* Firefox */
  background: linear-gradient(to right, red , yellow); /* Sintaxe padrão*/
}
</style>

<div>
<p>texto</p>
</div>