sectionH {
  background: rgba(0,0,0,0.7);
  width: 100%;
  position: fixed;
  z-index: 100;
}

/*float: center;*/
img.enlace{
border:0; 
}
a img.enlace {
border: 1px solid #00c7ec;
}

a:hover img.enlace {
border: 1px solid #00c7ec;
color: white;
box-shadow: 0 0 30px 0 rgba(0, 199, 236, 0.5);
background-color: #00c7ec;
-webkit-transition: all 0.2s ease-out;
-moz-transition: all 0.2s ease-out;
transition: all 0.2s ease-out;
}

nav {
  float: right;
}

nav ul {
  list-style: none;
  overflow: hidden; 
}

nav ul li {
  float: right;
  font-family: Arial, sans-serif;
  font-size: 16px;
}
nav ul li a {
  display: block;
  padding: 10px;
  color: #fff;
  text-decoration: none;
}
nav ul li:hover {
  background: #eca023;
}

nav ul li:hover {
  background: #eca023;
}