body{
  font-family: 'Droid Sans', 'Helvetica', Arial, sans-serif;
}

header{
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  justify-content: space-between;
  margin: 0;
  padding: 0;
  position: absolute; /* posicion absoluta a navegador */
  top: 0;             /* ajusta a borde de navegador */
  left: 0;
  right: 0;
  height: 50px;
  line-height: 50px;
}

.contenido {
	position:relative;
	background-color:#000;
	height:427px;
	width:100%;
	}

.boton img {
  margin: 0;
  padding: 5px;
  width: 30px;
  height: 30px;
  background: black;
  border-radius: 50%;
  text-align: center;
  vertical-align: middle;
}

.boton:hover img{ background: green; }

#map{
  margin: 0;
  padding: 0;
}