.navbar-button { 
  width: 90%;
  margin: 0 5% 0 5%; /* or whatever you like */
  text-align: center;
}
html,body{
    height: 100%
}
.navbar-fixed-side-left {
  left: 0;
}
.navbar-fixed-side-right {
  right: 0;
}
.navbar-fixed-side {
  position: fixed;
  border-width: 0;
  z-index: 1030;
  min-height: 5px;
  min-width: 5px;
  max-width: 300px;
  margin-bottom: 0;
  border: 0px solid transparent;
}
.navbar-fixed-side .navbar-toggle {
  float: none;
  margin: 0;
}
.navbar-fixed-side .nav > li > a {
  width: 100%;
  padding: 5px;
}
.navbar-fixed-side .dropdown-menu > li > a {
  padding: 5px;
}
.navbar-fixed-side .dropdown-header {
  padding: 5px;
}
.navbar-fixed-side .navbar-nav {
  margin: 0;
}
.navbar-fixed-side .navbar-nav > li {
  float: none;
}
.navbar-fixed-side .navbar-nav > li > a {
  padding: 5px;
  line-height: 20px;
}
.navbar-fixed-side .navbar-nav .open .dropdown-menu > li > a,
.navbar-fixed-side .navbar-nav .open .dropdown-menu .dropdown-header {
  padding: 3px 5px 3px 15px;
}
.navbar-fixed-side .container {
  width: 100%;
  padding: 0;
}
.navbar-fixed-side .navbar-header {
  float: none;
  margin: 0;
}
.navbar-fixed-side .navbar-collapse {
  padding: 0 2px;
}
.navbar-fixed-side .container .navbar-collapse {
  margin: 0;
}
.navbar-fixed-side .container .navbar-brand {
  margin: 0;
}
.navbar-fixed-side .navbar-brand {
  float: none;
  height: 100%;
  padding: 5px 3px;
  font-size: 18px;
  line-height: 20px;
}