Implemented an example modal

public/styles/objects/_modal.scss

@@ -0,0 +1,83 @@
+/*
+ *  Modal
+ *    Popup box designed to alert, or offer a unique interaction method.
+ *
+ *  Dependencies:
+ *    styles/tools/_absolute-centering.scss
+ *    styles/tools/_shadow.scss
+ *    styles/settings/z.scss
+ *
+ *  Version:
+ *    1.0.0 - 2018/07/05
+ */
+$o-modal--backdrop: rgba(0, 0, 0, 0.7);
+$o-modal--background: white;
+$o-modal--padding: 0.5em;
+
+.o-modal {
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  z-index: $s-z--modal;
+
+  &__inner {
+    position: relative;
+    width: 100%;
+    height: 100%;
+  }
+
+  &__backdrop {
+    position: absolute;
+    left: 0;
+    top: 0;
+    width: 100%;
+    height: 100%;
+    background: $o-modal--backdrop;
+  }
+
+  &__box {
+    @include t-absolute-center-x-y();
+    @extend %t-dp--shadow;
+    @extend %t-flexbox;
+    @include t-flex-wrap(wrap);
+    @include t-flex-direction(column);
+    @include t-align-items(flex-start);
+    @include t-align-content(flex-start);
+    background: $o-modal--background;
+    width: 100%;
+    height: 100%;
+    max-width: 95%;
+    max-height: 95%;
+
+    &-body {
+      width: 100%;
+      @include t-flex-grow(1);
+      position: relative;
+
+      /* Unfortunately flex can only get us half way there */
+      &-inner {//Hacks our content so it will never overflow its container.
+        position: absolute;
+        top: 0;
+        left: 0;
+        width: 100%;
+        height: 100%;
+        overflow-y: auto;
+        padding: $o-modal--padding;
+      }
+    }
+
+    &-footer {
+      width: 100%;
+      padding: $o-modal--padding;
+    }
+  }
+
+  @include t-media-query($s-xsmall-up) {
+    &__box {
+      width: 800px;
+      height: 600px;
+    }
+  }
+}