Improves layout styles

app/assets/stylesheets/participacion.scss

@@ -280,7 +280,7 @@ header {
     min-height: rem-calc(48);
 
     @media (min-width: $small-breakpoint) {
-      min-height: rem-calc(189);
+      min-height: 189px;
     }
   }
 
@@ -901,12 +901,6 @@ form {
   }
 }
 
-.alert-layout {
-  position: absolute;
-  top: 0;
-  width: 100%;
-}
-
 span.error, small.error {
   background: $alert-bg;
   color: $alert-color;
@@ -923,6 +917,11 @@ label.error, label.error a {
   color: $alert-color;
 }
 
+.alert-messages {
+  background-color: white;
+  padding-top: rem-calc(24);
+}
+
 // 10. User account
 // - - - - - - - - - - - - - - - - - - - - - - - - -
 
@@ -1351,7 +1350,7 @@ table {
 // - - - - - - - - - - - - - - - - - - - - - - - - -
 
 .verification {
-  min-height: 60%;
+  min-height: rem-calc(600);
 
   @media (min-width: $small-breakpoint) {
     .left + .left {