.column {
  float: left;
  width: 30%;
}
.menu_botones {
  float: right;
  width: 70%;
  vertical-align: top;
  
}

.botones_filtros_menu
{
  height: 50%;/*a que altura poner la div*/
}

/* Clear floats after the columns */
.row:after {
  content: "";
  display: table;
  clear: both;
}

.cabecera {
    margin-top: 0px;
  margin-left: 0px;
  margin-right: 0px;
  margin-bottom: 0px
}

/* Para los menus desplegables de la cabecera */

.dropbtn {
  background-color: #4CAF50;
  color: white;
  padding: 16px;
  font-size: 16px;
  border: none;
}

.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f1f1f1;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

.dropdown-content a {
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
}

.dropdown-content a:hover {background-color: #ddd;}

.dropdown:hover .dropdown-content {display: block;}

.dropdown:hover .dropbtn {background-color: #3e8e41;}