Create Collapsed Sidebar Panel

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<button class="opennet" onclick="openNav()">Sidebar panel <font color="red">☰</font></button>

.netbar a {
  padding: 8px 8px 8px 32px;
  text-decoration: none;
  font-size: 25px;
  color: #ccc;
  display: block;
  transition: 0.3s;
border: 1px solid #222;

}

.netbar a:hover {
  color: #555;

}

.netbar .closenet {
  position: absolute;
  top: 0;
  right: 25px;
  font-size: 36px;
color: red;
border: 0px solid #222;
}

.opennet{
  font-size: 20px;
  cursor: pointer;
  background-color: #18191b;
  color: #fff;
  padding: 10px 15px;
  border: none;
border-radius: 4px;
}

.opennet:hover {
  background-color:gray;
 color: #000;
}

</style>

function closeNav() {
  document.getElementById("netsidebar").style.width = "0";
}

</script>