body{background: #fff; font-family: 'verdana';}

a{border:0px;}
.principal{width: 1011px; height: 675px; background: url(../img/principal.png); transition: opacity .25s ease-in;}
.fondo_alumnos{width: 1011px; height: 675px; background: url(../img/fondo_alumnos.png); transition: opacity .25s ease-in;}
.fondo_admon{width: 1011px; height: 675px; background: url(../img/fondo_admon1.png); transition: opacity .25s ease-in;}
.fondo_admon1{width: 1011px; height: 675px; background: url(../img/fondo_admon.png); transition: opacity .25s ease-in;}
.btn{transition: opacity .25s ease-in; cursor: pointer; border: 0px; position:absolute;}
.btn:hover{opacity:0.8; filter:alpha(opacity=80);}


.menubtn4{width: 130px; height: 60px; float: right; background: url(../img/btninicio.png); transition: opacity .25s ease-in; cursor: pointer; float:left;}
.menubtn4:hover{opacity:0.7; filter:alpha(opacity=70);}


.btnmod1{width: 291px; height: 161px; background: url(../img/btnmod1.png); transition: opacity .25s ease-in; cursor: pointer; position:absolute;}
.btnmod1:hover{opacity:0.7; filter:alpha(opacity=70);}