Never allow the background body color to be seen on a tiny screen

[lmno.games] / style.css

diff --git a/style.css b/style.css
index 899b902b78e680d7ef91df985951b23cd9bc4969..4cb0b3f7fc945be370b2547711e17c418618e341 100644 (file)
--- a/style.css
+++ b/style.css
@@ -18,3 +18,144 @@ h2 {
     font-size: 110%;
     font-weight: bold;
 }
+
+/*\
+|*|
+|*| Overall page layout
+|*|
+|*| Assumes: Top-level div with id="page" for all content
+|*|
+\*/
+
+/* Mobile-first: At small sized we have a white background and use the
+ * entire screen width for the page (so the background color of the
+ * body is not visible anywhere). */
+body {
+    background-color: #333738;
+}
+
+#page {
+    background-color: white;
+}
+
+/* For a small screen (in either width or height) change the
+ * background of the body element to white so the application always
+ * appears as if it is "full screen".
+ */
+@media screen and (max-width: 500px) and (max-height: 860px) {
+    body {
+        background-color: white;
+    }
+}
+
+/* We never let the page content get larger than a large fixed width.
+ *
+ * And when the screen is wide enough, we can afford some "wasted"
+ * space on either side of the page content. This starts at 0 for a
+ * 620px wide page up to 50px on either side for a 720px wide page.
+ *
+ * Wider than that and we start to see the background on either side
+ * of the page content.
+ */
+#page {
+    box-sizing: border-box;
+    max-width: 720px;
+    margin-left: auto;
+    margin-right: auto;
+    padding-top: 0;
+    padding-bottom: 0;
+}
+
+@media screen and (min-width: 620px) and (max-width: 720px) {
+    #page {
+        padding-left: calc((100% - 620px)/2);
+        padding-right: calc((100% - 620px)/2);
+    }
+}
+
+@media screen and (min-width: 720px) {
+    #page {
+        padding-left: 50px;
+        padding-right: 50px;
+    }
+}
+
+/* The calculations for height are different. We don't have any
+ * vertical centering, so instead we have only some fixed padding on
+ * the top. Then, the margin which allows the background to be visible
+ * on the top and bottom starts appearing at a viewport height of 648
+ * and tops out at a size of 36px.
+ */
+#page {
+    min-height: 500px;
+    padding-top: 1em;
+}
+
+@media screen and (min-height: 648px) and (max-height: 720px) {
+    #page {
+        margin-top: calc((100vh - 648px)/2);
+        margin-bottom: calc((100vh - 648px)/2);
+    }
+}
+
+@media screen and (min-height: 720px) {
+    #page {
+        margin-top: 36px;
+        margin-bottom: 36px;
+    }
+}
+
+/*\
+|*|
+|*| Responsive form layout
+|*|
+\*/
+
+/*
+ *
+ * Within the form, fields can be placed in <div> elements with
+ * class "form-field". Each can also have an additional class of one
+ * of "small", "medium", or "large". These classes will be used to
+ * select either a 1- or 2-column layout for each row depending on the
+ * width of the screen.
+ *
+ * Expected layout is as follows:
+ *
+ *   "large"   rows: 1-column on all devices
+ *
+ *   "medium"  rows: 2-column on wide displays (laptop/desktop/tablet)
+ *                   1-column on small display (phones)
+ *
+ *   "small"   rows: 2-column on all devices
+ *
+ * Finally, a class of either "left" or "right" will select which
+ * column the field should appear in for fields that end up in 2
+ * columns.
+ */
+form {
+    max-width: 100%;
+    display: grid;
+    grid-template-columns: 49% 49%;
+    grid-column-gap: 2%;
+}
+
+.form-field.small.left,.form-field.medium.left {
+    grid-column-start: 1;
+}
+
+.form-field.small.right,.form-field.medium.right {
+    grid-column-start: 2;
+}
+
+.form-field.large {
+    grid-column-start: 1;
+    grid-column-end: span 2;
+}
+
+/* For a narrow screen, use a single-column for medium form fields. */
+@media screen and (max-width: 600px) {
+    .form-field.medium.left,.form-field.medium.right {
+       grid-column-start: 1;
+        grid-column-end: span 2
+    }
+}