.hidden{
 display: none;
}

.open{
  display: flex;
  justify-content: center;
  align-items: center;
  position: absolute;
  left: 10px;
  z-index: 100;
  background: #fff;
  cursor: pointer;
}

.open span, .open span:before, .open span:after{
  content: '';
  display: block;
  height: 3px;
  width: 20px;
  border-radius: 3px;
  background: #CC9900;
  transition: 0.5s;
  position: absolute;
}

.open span:before{
 bottom: 8px;
}
.open span:after{
 top: 8px;
}

#menu_input:checked ~ .open span {
  background: rgba(255, 255, 255, 0);
}

#menu_input:checked ~ .open span::before {
  bottom: 0;
  transform: rotate(45deg);
}

#menu_input:checked ~ .open span::after {
  top: 0;
  transform: rotate(-45deg);
}

.mnb_content{
 width: 70%;
 height: 100%;
 position: fixed;
 top: 70;
 right: 100%;
 text-align: left;
 z-index: 99;
 transition: 1s; 
}

.mnb_list{
list-style: none;
background: #CC9900; 
height: 100%;
overflow-y: scroll;
}

#menu_input:checked ~ .mnb_content{
 left: 0;
}