Update style.css

style.css

@@ -0,0 +1,16 @@
+#col-container {
+  max-width: 600px;
+  margin-left: auto;
+  margin-right: auto;
+}
+.heightfit{
+  height:150px;
+}
+.heightfit1{
+  height:100px;
+}
+#row-flex {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}