.pagina {
background-color: #000000;
    max-width: 960px;
    margin: left;
}

.body {
    background: #000000 ;
    font-family: "Arial";   
}



.header {
    width: 100%;
    height: 220px;
    background-position:left;
    margin: 0px auto;
    text-align: left;
    padding-top: 0px;
    padding-bottom: 0px;
}

ul, menu, dir {
    display: block;
    list-style-type: disc;
    -webkit-margin-before: 1em;
    -webkit-margin-after: 1em;
    -webkit-margin-start: 0px;
    -webkit-margin-end: 0px;
    -webkit-padding-start: 40px;
}
body {
  margin: 10px auto;
  background: #000000;
}

.menudes {
font-family: "arial";
position: relative;
overflow: hidden;
width: 960px;
height: 35px;
line-height: 35px;
margin: 10px auto;
border-radius: 8px;
background: #000000;
}
.menudes ul {
  list-style: none;
  text-align: center;
  margin: 0;
  padding: 0;
  font-size: 0;
}
.menudes ul li {
display: inline-block;
width: 25%;
box-sizing: border-box;
font-size:18px;
}
.menudes ul li a {
  color: #18ff4d;
  text-decoration: none;
}
.marca {
position: absolute;
bottom: 2px;
left: -12.5%; /* Al menos 1/2 del ancho de cada enlace */
width: 12.5%; /* 1/2 del ancho de cada enlace */
height: 4px;
background: #18ff4d;
transition: 0.5s ease-in-out; 
}
.menudes ul li:nth-child(1):hover ~ .marca {
left: 6.25%; /* 1/4 Ancho del enlace */
}
.menudes ul li:nth-child(2):hover ~ .marca {
left: 31.25%; /* 1/4 Ancho del enlace + 1 vez ancho enlace */
}
.menudes ul li:nth-child(3):hover ~ .marca {
left: 56.25%; /* 1/4 Ancho del enlace + 2 veces ancho enlace */
}
.menudes ul li:nth-child(4):hover ~ .marca {
left: 81.5%; /* 1/4 Ancho del enlace + 3 veces ancho enlace */
}

.section {
font-family: "arial";
background-color: #ffffff ;
    max-width: 960px;
    background-position: center;
    margin: 10px auto;
    padding-top: 10px;
    padding-bottom: 10px;
}

.fotoperfil {
font-family: "arial"; 
display: inline-block;   
position: relative;
    float: left;
    width: 25%;
}

.materias {
display: inline-block;
    color: #ffffff;
    font-family: "arial";
font-size: 13px;
    position: relative;
    float: left;
  width: 50%;
padding-top: 5px;
padding-right: 50px;
    padding-bottom: 0px;
    padding-left: 70px;

}
.texto_derecha {
display: inline-block;
    font-family: "arial";
font-size: 13px;
    position: relative;
    float: left; 
  width: 36%;
background: #52f76b;
padding-top: 5px;
padding-right: 0px;
    padding-bottom: 15px;
    padding-left: 50px;
    margin-left: 4rem;
}


footer {
    font-family: "arial";
	font-size: 8px;
    max-width: 960px;
    background-position:center;
    margin: 5% auto;
    padding-top: 1px;
padding-right: 5px;
    padding-bottom: 5px;
    padding-left: 5px;
    text-align: left;
    color: #e6e6e6 ;
    float: left;
    border: 1px solid #18ff4d;
}

.footer1{

display: inline-block;
    position: relative;
    float: left;
  width: 3%;
padding-top: 10px;
padding-right: 2px;
    padding-bottom: 5px;
    padding-left: 25px;
}

.footer2 {
    

display: inline-block;
    font-family: "arial";
font-size: 12px;
    position: relative;
    float: right;
  width: 75%;
    padding-top: 2px;
padding-right: 5px;
    padding-bottom: 2px;
    padding-left: 5px;
}

.imagenpropuesta {
     position: relative;
    float: right;
    width: 100%;
    padding-top: 2px;
padding-right: 0px;
    padding-bottom: 0px;
    padding-left: 0px;
}