*{
 margin:0;
 padding:0;
}
.main_menu
{
 position: fixed;
 display: none;
 float: left;
 margin: 0 auto;
 color: #fff;
 width: 100%;
 height:100%;
 box-sizing: border-box;
 overflow: hidden;
 background-color: rgba(0, 0, 0, 0.5);
 background: rgba(0, 0, 0, 0.5);
 color: rgba(0, 0, 0, 0.5);
 z-index: 999999;  
}
.menu_body
{
 display: block;
 float: left;
 margin-top: 6%;
 margin-left: 5%;
 width: 25%;
 height: 40%;
 border-radius: 5px;
 box-shadow: 0 5px 5px rgba(0, 0, 0, 0.2);
 z-index: 99999;
 background: white;
}
.menu_body a#btn_logclose
{
 display: block;
 float: right; 
 margin-top: 5px;
 margin-right: 5px;
 width: 20px;
 height: 20px;
}
.menu_body p#titulomenu 
{
 display: block; 
 float: left;
 width: 90%;
 height: auto;
 font-weight: 400; 
 font-family: "Open Sans", sans-serif;
 font-optical-sizing: auto;
 font-size: 10pt;
 color: black;
 margin-left: 1%;
 margin-top: 5px;
 border-bottom: 1px solid black;
}
.menu_body a#btn_home,a#btn_somos,a#btn_libro,a#btn_regis,a#btn_cuenta,a#btn_salir
{
 float: left;
 margin-top: 1%;
 margin-left: 1%;
 width: 90%;
 height: 30px;
 line-height: 30px;
 background: transparent;
 text-align: left !important;
}
@media only screen and (min-device-width : 320px) and (max-device-width : 480px)
{
 .menu_body
 {
  margin-left: 5%;
  width: 90%;
  height: 35%;
 }
}