Center button group horizontally

static/main.css

@@ -5,7 +5,7 @@ html{
 
 /* Navigation bar */
 nav{
-    background-color: #CCCCFF
+    background-color: #CCCCFF;
 }
 
 nav > ul{
@@ -15,11 +15,15 @@ nav > ul{
     overflow: hidden;
 }
 
-nav > ul >li {
+nav ul li {
     display: inline-block;
     padding: 14px 16px;
 }
 
+li a{
+    text-decoration: none;
+}
+
 .active{
     background-color: white
 }
@@ -39,6 +43,11 @@ nav > ul >li {
   box-shadow: 0 12px 16px 0 rgba(0,0,0,0.24), 0 17px 50px 0 rgba(0,0,0,0.19);
 }
 
+.btn-group{
+    position: relative;
+    left: 25%;
+}
+
 .btn-group button {
   background-color: #4CAF50; /* Green background */
   border: 1px solid green; /* Green border */