Added overflow stop for mobile menu, shifting some stuff.

public/styles/objects/_app.scss

@@ -10,9 +10,8 @@
  */
 .o-app {
   position: relative;
-  min-height: 100vh;
+  height: 100vh;
   width: 100%;
-
-  @extend %t-flexbox;
-  @include t-flex-direction(column);
+  overflow-y: scroll;
+  overflow-x: hidden;
 }

public/styles/objects/_hamburger-menu.scss

@@ -3,18 +3,29 @@
  *    Mobile-Centric openable menu with a hamburger icon to toggle.
  *
  *  Dependencies:
+ *    styles/settings/animation.scss
  *    styles/settings/colors.scss
  *    styles/settings/z.scss
  *
  *  Version:
  *    1.0.0 - 2018/06/12
  */
+$o-hamburger-menu--max: 200%;
+$o-hamburger-menu--pos-x: 100%;
+$o-hamburger-menu--pos-y: 0%;
+@include t-keyframes(o-hamburger-menu--open) {
+  from { clip-path: circle(0% at $o-hamburger-menu--pos-x $o-hamburger-menu--pos-y); }
+  to { clip-path: circle($o-hamburger-menu--max at $o-hamburger-menu--pos-x $o-hamburger-menu--pos-y); }
+}
+
+@include t-keyframes(o-hamburger-menu--close) {
+  from { clip-path: circle($o-hamburger-menu--max at $o-hamburger-menu--pos-x $o-hamburger-menu--pos-y); }
+  to { clip-path: circle(0% at $o-hamburger-menu--pos-x $o-hamburger-menu--pos-y); }
+}
+
 .o-hamburger-menu {
-  border: 1px solid red;
 
   &__menu {
-    @extend %t-list-blank;
-
     display: none;
     position: fixed;
     top: 0;
@@ -22,12 +33,37 @@
     width: 100%;
     height: 100%;
     background: $s-color--menu__background;
+    transition: all 1s $s-animation--ease-out;
 
     z-index: $s-z--menu;
+
+    @include t-animation-fill-mode(forwards);
+    @include t-animation-timing-function($s-animation--ease-out);
+    @include t-animation-duration(0.4s);
+  }
+
+  &__links {
+    @extend %t-list-blank;
+    padding: 1em;
   }
 
   &__link {
     @extend %t-list-litem-blank;
+    display: block;
+    font-size: 1.25em;
+    width: 100%;
+    position: relative;
+    border: 1px solid red;
+
+    &-link {
+      position: relative;
+      display: block;
+      padding: 1.5em 0;
+    }
+
+    &:hover:before {
+      //@include t-translate-x(5%);  Disabled due to not being needed on mobile
+    }
   }
 
   &__button {
@@ -47,6 +83,14 @@
   &.is-open {
     .o-hamburger-menu__menu {
       display: block;
+      @include t-animation-name(o-hamburger-menu--open);
+    }
+  }
+
+  &.is-closing {
+    .o-hamburger-menu__menu {
+      display: block;
+      @include t-animation-name(o-hamburger-menu--close);
     }
   }
 }

public/styles/objects/_page-transition.scss

@@ -20,7 +20,7 @@
 .o-page-transition__container {
   overflow: hidden;
   width: 100%;
-  height: 100%;
+  min-height: 100%;
   position: relative;
 }