Update gridism.

site/_sass/_gridism.scss

@@ -53,8 +53,10 @@
 .grid .half,           .grid .w-1-2 { width: 50%; }
 .grid .one-third,      .grid .w-1-3 { width: 33.3332%; }
 .grid .two-thirds,     .grid .w-2-3 { width: 66.6665%; }
-.grid .one-quarter,    .grid .w-1-4 { width: 25%; }
-.grid .three-quarters, .grid .w-3-4 { width: 75%; }
+.grid .one-quarter,
+.grid .one-fourth,     .grid .w-1-4 { width: 25%; }
+.grid .three-quarters,
+.grid .three-fourths,  .grid .w-3-4 { width: 75%; }
 .grid .one-fifth,      .grid .w-1-5 { width: 20%; }
 .grid .two-fifths,     .grid .w-2-5 { width: 40%; }
 .grid .three-fifths,   .grid .w-3-5 { width: 60%; }
@@ -62,6 +64,19 @@
 .grid .golden-small,   .grid .w-g-s { width: 38.2716%; } /* Golden section: smaller piece */
 .grid .golden-large,   .grid .w-g-l { width: 61.7283%; } /* Golden section: larger piece */
 
+/* Clearfix after every .grid */
+.grid {
+  *zoom: 1;
+}
+.grid:before, .grid:after {
+  display: table;
+  content: "";
+  line-height: 0;
+}
+.grid:after {
+  clear: both;
+}
+
 /* Utility classes */
 .align-center { text-align: center; }
 .align-left   { text-align: left; }
@@ -69,14 +84,18 @@
 .pull-left    { float: left; }
 .pull-right   { float: right; }
 
-.show-on-mobiles {
-  display: none;
+/* A property for a better rendering of images in units: in
+   this way bigger pictures are just resized if the unit
+   becomes smaller */
+.unit img {
+  max-width: 100%;
 }
 
 /* Responsive Stuff */
 @media screen and (max-width: 568px) {
-  /* Stack anything that isn’t full-width on smaller screens */
-  .grid .unit {
+  /* Stack anything that isn’t full-width on smaller screens 
+     and doesn't provide the no-stacking-on-mobiles class */
+  .grid:not(.no-stacking-on-mobiles) > .unit {
     width: 100% !important;
     padding-left: 20px;
     padding-right: 20px;
@@ -93,18 +112,13 @@
   .hide-on-mobiles {
     display: none !important;
   }
-  .show-on-mobiles {
-    display: block !important;
-  }
-  a .show-on-mobiles {
-    display: inline !important;
-  }
 }
 
 /* Expand the wrap a bit further on larger screens */
-/*@media screen and (min-width: 1180px) {
-  .wrap .grid {
+@media screen and (min-width: 1180px) {
+  .wider .grid,
+  .grid.wider {
     max-width: 1180px;
     margin: 0 auto;
   }
-}*/
+}

site/_sass/_style.scss

@@ -957,3 +957,17 @@ code.output {
     padding: 0 10px;
   }
 }
+
+
+.show-on-mobiles {
+  display: none;
+}
+
+@media screen and (max-width: 568px) {
+  .show-on-mobiles {
+    display: block !important;
+  }
+  a .show-on-mobiles {
+    display: inline !important;
+  }
+}