Cinta | Programar Plus

<h1 class="ribbon">
   <strong class="ribbon-content">Everybody loves ribbons</strong>
</h1>
.ribbon {
 font-size: 16px !important;
 /* This ribbon is based on a 16px font side and a 24px vertical rhythm. I've used em's to position each element for scalability. If you want to use a different font size you may have to play with the position of the ribbon elements */

 width: 50%;
    
 position: relative;
 background: #ba89b6;
 color: #fff;
 text-align: center;
 padding: 1em 2em; /* Adjust to suit */
 margin: 2em auto 3em; /* Based on 24px vertical rhythm. 48px bottom margin - normally 24 but the ribbon 'graphics' take up 24px themselves so we double it. */
}
.ribbon:before, .ribbon:after {
 content: "";
 position: absolute;
 display: block;
 bottom: -1em;
 border: 1.5em solid #986794;
 z-index: -1;
}
.ribbon:before {
 left: -2em;
 border-right-width: 1.5em;
 border-left-color: transparent;
}
.ribbon:after {
 right: -2em;
 border-left-width: 1.5em;
 border-right-color: transparent;
}
.ribbon .ribbon-content:before, .ribbon .ribbon-content:after {
 content: "";
 position: absolute;
 display: block;
 border-style: solid;
 border-color: #804f7c transparent transparent transparent;
 bottom: -1em;
}
.ribbon .ribbon-content:before {
 left: 0;
 border-width: 1em 0 0 1em;
}
.ribbon .ribbon-content:after {
 right: 0;
 border-width: 1em 1em 0 0;
}

Protector

Esta técnica utiliza valores de índice z negativos en algunos de los pseudoelementos. Eso significa que pueden ir detrás de otros elementos que tienen fondos opacos, lo que arruina el efecto. Para solucionar esto, deberá asegurarse de que el padre inmediato de las cintas no tenga un fondo aplicado y tenga una posición relativa con un índice z positivo. Use una envoltura adicional si es necesario.

<div class="non-semantic-protector"> 
   <!-- ribbons and other content in here -->
</div>
.non-semantic-protector { position: relative; z-index: 1; }

Ejemplo

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