twitter bootstrap 3 - how change navbar height without corrupt collapse nave mode? -

i want have nave 40px height , change css property achive after when resize window navbar not work in collapse mode

css changed:

.navbar {     border-radius:0;     height:40px !important;     margin-bottom:20px;  }  .navbar-nav > li > {     padding-top:10px;     padding-bottom:10px;     } .navbar-brand {     height:40px;     padding-top:10px; } .navbar-toggle {     padding: 9px 10px;     margin-top: 4px;     margin-bottom: 4px; }