input[type="checkbox"]#collapsed  {
 display: none; 
}
@media screen and (max-width: 959px) {
  #collapse-icon {
    background:url(../images/collapse.png) no-repeat left top;
    background-size:30px 30px;
    width:30px;
    height:30px;
    display:block;
    cursor:pointer;
  }
  input + #collapse-icon + .nav {
    display:none;
  }
  input:checked + #collapse-icon + .nav {
    display:block;
    padding:5px
  }
  .menu ul {
    float:left; 
    width:100%;    
  }  
  .menu ul li {
    clear:left;
  }
}