Initial PHP Slim project structure; built a very basic site template

public/css/wyrm.css

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+body{
+  background-color: #e6e6e6;
+}
+
+/* set the max-width for centered content */
+.container{
+  max-width: 1100px;
+}
+
+#main-content{
+  margin-top: 25px;
+  padding: 12px 25px;
+  background: white;
+}
+
+/* global navigation bar styles */
+.navbar{
+  padding: 10px 18px;
+  background-color: #212121;
+  color: white;
+  font-size: 2.5rem;
+  font-weight: bold;
+}
+
+.navbar ul{
+  margin: 0;
+  padding: 0;
+  list-style: none;
+}
+
+.navbar li{
+  display: inline-block;
+  margin-bottom: 0;
+}
+.navbar li:not(:first-child){
+  margin-left: 10px;
+}
+
+.navbar li>a{
+  color: #eee;
+  text-decoration: none;
+  transition: color 220ms ease-in-out;
+}
+.navbar li>a:hover{
+  color: white;
+}