Fixes #3239 Improving CSS style of login page

html/themes/default/login.css

@@ -6,15 +6,27 @@ font-weight:bold;
 font-size:12px;
 }
 
+html, body {
+min-height:100%;
+}
+
 div#window_container {
 text-align:center;
+box-shadow:0 0 2px black;
+width:100%;
+bottom:0;
+top:52px;
+position:absolute;
 }
 
 div#window_div {
 min-width:50%;
 margin-top:100px;
-border:1px solid #AAAAAA;background-color:white;
+border:1px solid #AAAAAA;
+background-color:white;
 display:inline-block;
+border-radius:10px;
+box-shadow:0 0 3px black inset;
 }
 
 div#window_titlebar {
@@ -22,6 +34,7 @@ text-align:center;
 border-bottom:1px solid #AAAAAA;
 padding:8px;
 background-color:#DBE6C6;
+border-radius:10px 10px 0 0;
 }
 
 div#window_titlebar > p {
@@ -31,9 +44,6 @@ font-size:24px;
 font-weight:bold;
 }
 
-div#window_content {
-}
-
 div#window_content > div {
 padding:10px;
 }
@@ -46,27 +56,18 @@ div#window_footer > div {
 display:inline-block;
 width:47%;
 padding:1%;
-text-align:left;
-}
-html.rtl div#window_footer > div {
-text-align:right;
 }
 
 div#window_footer > div:nth-child(1) {
-text-align:left;
 color:red;
 font-weight:bold;
 }
-html.rtl div#window_footer > div:nth-child(1) {
-text-align:right;
+html.ltr div#window_footer > div:nth-child(1) {
+text-align:left;
 }
-
-div#window_footer > div:nth-child(2) {
+html.rtl div#window_footer > div:nth-child(1) {
 text-align:right;
 }
-html.rtl div#window_footer > div:nth-child(2) {
-text-align:left;
-}
 
 /* On small screens */
 @media (max-width: 640px) {
@@ -78,6 +79,7 @@ text-align:left;
   display:block;
   width:auto;
   padding:5px;
+  text-align:center !important;
   }
   div#window_footer.plugbottom > div:nth-child(2) > input[type=submit] {
   width:100% !important;