/* Smartphones (portrait & landscape) */
@media only screen 
and (max-device-width : 480px) {
  
	body {
			background-color: #06A2D6;
}
 	header {
 		visibility: hidden;
}

 	footer {
 		visibility: hidden;
}
 	#obj_parametro{
 	  display:none
}
 	.recuadro .mensaje{
 	display: none
}
 	
 	h1 {
 		text-align: center;
}
 	#navasignaturas li {
		display: inline;
		text-align: center;
}
	.contenido {
		display:flex;
        align-items:center;
        flex-direction: column;
}
	article {
  		display:flex;
  		align-items:center;
  		justify-content:center;
}
	#imgPerfil {
		width: 200px;
		position: absolute;
	    top: 80px;
	    height: 115px;
	
}
	#video {
		position: absolute;
	    top: 180px;
	    left: 30px;
	    width: 250px;
	    height: 150px;
}
    #video, #imgPerfil{
        margin: 10px;
}

#tabla {
	border: 1px solid #000;
	margin: 0 auto;
	border-collapse: collapse;
}

#tabla th {
	background: #2E2EFE;
}

#tabla td {
	background: #81BEF7;
}

#tabla td, th {
	text-align: center; 
	border: 1px solid #000;
	border-collapse: collapse;
	font-family: "Times New Roman", Times, serif;
}