General updates

assets/sass/components/_alert.scss

@@ -0,0 +1,28 @@
+.alert {
+    padding: $base-spacing-unit;
+    margin-bottom: $base-spacing-unit;
+    border: 1px solid transparent;
+    > p,
+    > ul {
+        margin-bottom: 0;
+    }
+    > p + p {
+        margin-top: $base-spacing-unit;
+    }
+    &.alert--success {
+        color: $success-colour;
+        border-color: $success-colour;
+    }
+    &.alert--info {
+        color: $info-colour;
+        border-color: $info-colour;
+    }
+    &.alert--warning {
+        color: $warning-colour;
+        border-color: $warning-colour;
+    }
+    &.alert--danger {
+        color: $danger-colour;
+        border-color: $danger-colour;
+    }
+}

assets/sass/components/_buttons.scss

@@ -5,6 +5,11 @@
     display: inline-block;
     padding: ($base-spacing-unit / 4) $base-spacing-unit;
     text-align: center;
+    white-space: nowrap;
+    vertical-align: middle;
+    touch-action: manipulation;
+    cursor: pointer;
+    user-select: none;
     width: auto;
     transition: all .5s;
     &::-moz-focus-inner {
@@ -17,6 +22,11 @@
         color: $brand-colour;
         border: 1px solid $brand-colour;    
     }
+    .is-disabled,
+    &:disabled {
+        pointer-events: none;
+        opacity: .65;
+    }
 }
 
 .btn--inverse {
@@ -33,6 +43,9 @@
 .btn--block {
     display: block;
     width: 100%;
+    + .btn--block {
+        margin-top: $base-spacing-unit / 4;
+    }
 }
 
 .btn--link {

assets/sass/components/_nav.scss

@@ -1,14 +1,14 @@
 .nav {
-  list-style: none;
-  margin: 0;
-  > li {
-      display: inline-block;
-      margin-right: $base-spacing-unit;
-      &:last-child {
-        margin-right: 0;
-      }
-    > a {
-      display: block;
+    list-style: none;
+    margin: 0;
+    > li {
+        display: inline-block;
+        margin-right: $base-spacing-unit;
+        &:last-child {
+            margin-right: 0;
+        }
+        > a {
+            display: block;
+        }
     }
-  }
 }