.contenedor_pestanas
{ height:30px; width:100%; position: relative; display: flex; }

.pestana 
{ width:49%; height:100%; background:#808080; color:#FFF; position:relative; border-radius:3px 3px 0px 0px; line-height:30px; cursor:pointer; border:1px Solid #BBB; text-align:center; }

.principal_pestanas
{ max-height:calc(100% - 120px) !important; height:80%; min-height:100px; width:100%; position: absolute; margin: auto; margin-bottom: 5px; }

.contenido_pestanas
{ max-height: calc(100% - 5px); height:100%; position: absolute; display:none; padding-bottom:20px; box-shadow:2px 3px 10px rgba(0,0,0,0.3); overflow-y:auto; min-height:300px;width:100%; }

.pestana_activa
{ background:rgb(249, 151, 66); }

.contenido_pestana_activa
{ z-index: 500; display:block; background:#1b1c1e;}
/*------------------------------------------------------------------------------------*/