input.menu-trigger { 
  left: 0;
  top: 0;
  height: 53px;
  width: 52px;
  z-index: 1001;
  opacity: 0;
  cursor: pointer;
}
ul.menu {
    overflow: hidden;
    padding: 0;
    margin: auto;
    list-style-type: none;
    background-color: #ffffff;
    transition: all 0.2s ease;
    z-index: 1000;
    display: table;
}
ul.menu li a {
  display: block; 
  padding: 6px 16px; 
  text-decoration: none;
  transition: all 0.2s ease;
}
ul.menu li a:hover { 
  color: #ffffff;
}
ul.menu li ul {
  padding: 0;
  margin: 0;
  list-style-type: none;
  margin-left: 10px;
  transition: all 0.3s ease;
  text-align:left;
}
ul.menu > li { 
  visibility:visible;
  transition: all 0.5s ease;
}
ul.menu > li.start {
  position: fixed;
  visibility: visible;
  background-color: #ffffff;
  text-align: center;
  display: none;
}
ul.menu > li.start a {
  width: 52px;
  text-align: center;
  padding: 0;
}
ul.menu > li.start + li {
  margin-top: 52px;
}
ul.menu:hover {  
  overflow-y: scroll;
}
ul.menu:hover > li {
  visibility: visible;
}
ul.menu:hover + div.overlay {
  width: 100%;
  height: 100%;
  opacity: 0.5;
  z-index: 999;
}
input.menu-trigger:checked + ul.menu {
  height: 100%;
  width: 80%;
  overflow-y: scroll;
}
input.menu-trigger:checked + ul.menu > li {
  visibility: visible;
}
input.menu-trigger:checked + ul.menu + div.overlay {
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  opacity: 0.5;
  z-index: 999;
}
div.overlay {
  opacity: 0;
  transition: all 0.2s ease;
}
@media screen and (min-width: 10px) {
  input.menu-trigger {
    display:none;
  }
  ul.menu {
    overflow: visible;
    transition-delay: 0.5s;     
  }
  ul.menu:hover {
   overflow: visible;
    transition-delay: 0.15s;
  }
  ul.menu:hover > li {
    visibility: visible;
    opacity: 1;   
  }
  ul.menu > li {
    position: relative;
    float: left;
    opacity:1;
    visibility:visible;
    transition: all 0.5s ease;
    transition-delay: 0.5s;
  }
  ul.menu > li > ul {
    top: 100% !important;
    left: 0 !important; 
  } 
  ul.menu > li:hover > ul {
    top: 100% !important;   
    opacity: 1;
  }
  ul.menu > li:hover > ul li {
    position: relative;
    width: 100%;
  }
  ul.menu > li:hover > ul li:hover > ul {
    opacity: 1;
  }
  ul.menu > li.start {
    position: relative;
    opacity: 1;
    visibility: visible;
  }
  ul.menu > li.start + li {
    margin-top: 0;
  }
  ul.menu li ul {
    position: absolute;
    opacity: 0;
    margin-left: 0;
    min-width: 200px;
    visibility: hidden;
    background-color: #ffffff;
    top: 0;
    left: 100%;
  }
  ul.menu li ul li {
    position: relative;
    white-space: nowrap;
  }  
  ul.menu li:hover ul {
    z-index: 1;
    transition: visibility 0s linear 0.2s, opacity 0.2s ease 0.2s;
  }
  ul.menu li:hover > ul {
    visibility: visible;
  }
  input.menu-trigger:checked + ul.menu {
    left: 0;
    height: 52px;
    width: 100%;   
    overflow: visible;
    transition-delay: 0.15s;
  }
  input.menu-trigger:checked + ul.menu > li {
    visibility: visible;
    opacity: 1;
    transition-delay: 0.15s;
  }
  div.overlay {
    display: none;
  }
}

/* menú responsive */

#boton_menu, #boton_menu_2 {
    position: relative;
    top: 5px;
    height: 30px;
    width: 30px;
    border: none;
    left: 0px;
}
    #boton_menu:hover {
        color: #000000;
    }
#contenedor_menu_boton .hamburguesa::after {    
    font-family: "FontAwesome";
    font-size: 21px;
}
#contenedor_menu_boton .equis::after {    
    font-family: "FontAwesome";
    font-size: 21px;
}
.contenedor_menu_boton {
    position: relative;
    left: 0px;
    top: 0px;
    z-index: 1000;
    height: 35px;
    width: 100%;
    background-color: #ffffff;
}
#left_column {
    position: fixed;
}
#center_column {
    z-index: 20;
}

@media screen and (min-width: 785px) {
    .contenedor_menu_boton {
        display: none;
    }
    .dreta {
        background-color: #ffffff;
        transform: translate3d(0px, 0px, 0px); /* afecta al menú horizontal en pantalles grans. El segón valor ha de ser 0. Si té valors negatius començarà a tapar el header */
        transition: transform 0.4s ease 0s, -webkit-transform 0.4s ease 0s;
    }
    .esquerra {
        transform: translate3d(-277px, 0px, 0px);
        transition: transform 0.4s ease 0s, -webkit-transform 0.4s ease 0s;
        height: 1px !important;
    }
    #boton_menu_2 {
        display: none;
    }
}
@media screen and (max-width: 784px) {   

    .row_cabecera {
        box-shadow: none;
    }
    #boton_menu_2 {
        display: block;
        height: 30px !important;
        background-color: transparent;
        margin-left: 10px;
        padding: 0px !important;
        border: none !important;
        box-shadow: none !important;
    }
    .dreta {
        background-color: transparent !important;
        transform: translate3d(0px, -30px, 0px); /* el segón valor ha de quedar a 0. Si te valors negatius començarà a tapar el header */
        transition: transform 0.4s ease 0s, -webkit-transform 0.4s ease 0s;
        z-index: 1000;
        position: relative;
    }
    .esquerra {
        transform: translate3d(-277px, -30px, 0px);
        transition: transform 0.4s ease 0s, -webkit-transform 0.4s ease 0s;
        height: 1px !important;
    }
    ul.menu {
        padding-left: 45px;
        margin: initial;
        margin-top: -26px;
        box-shadow: 0px 5px 5px 0px rgba(0, 0, 0, 0.3);
    }
        ul.menu > li {
            float: initial;
        }
        ul.menu li:hover ul {
            z-index: 1;
        }
        ul.menu li ul {
            left: 100% !important;
        }
        ul.menu > li:hover > ul {
            top: 0% !important;
        }
}