diff --git a/css/bootstrap-modal.css b/css/bootstrap-modal.css
index b1d2899..520da9e 100644
--- a/css/bootstrap-modal.css
+++ b/css/bootstrap-modal.css
@@ -36,14 +36,34 @@
 	left: 0;
 	right: 0;
 	overflow: auto;
+    text-align: center;
+}
+
+.modal-scrollable .modal {
+    text-align: left;
+}
+
+.modal-scrollable:after {
+    content: "";
+    height: 100%;
+    width: 0;
+    display: inline-block;
+    vertical-align: middle;
 }
 
 .modal {
 	outline: none;
-	position: absolute;
-	margin-top: 0;
-	top: 50%;
+	position: relative;
+	margin: 0;
+    width: auto;
+	top: auto;
+    left: auto;
+    right: auto;
+    bottom: auto;
 	overflow: visible; /* allow content to popup out (i.e tooltips) */
+    display: inline-block;
+    vertical-align: middle;
+    min-width: 530px;
 }
 
 .modal.fade {
@@ -55,7 +75,7 @@
 }
 
 .modal.fade.in {
-	top: 50%;
+	top: 0;
 }
 
 .modal-body {
@@ -91,8 +111,7 @@
 }
 
 .modal.container {
-  width: 940px;
-  margin-left: -470px;
+	max-width: 940px;
 }
 
 /* Modal Overflow */
@@ -118,8 +137,7 @@
 
 @media (min-width: 1200px) {
 	.modal.container {
-		width: 1170px;
-		margin-left: -585px;
+		max-width: 1170px;
 	}
 }
 
diff --git a/js/bootstrap-modal.js b/js/bootstrap-modal.js
index 5a40400..e1a6d70 100644
--- a/js/bootstrap-modal.js
+++ b/js/bootstrap-modal.js
@@ -65,15 +65,6 @@
 			
 			if (this.options.width){
 				this.$element.css('width', this.options.width);
-				
-				var that = this;
-				this.$element.css('margin-left', function () {
-					if (/%/ig.test(that.options.width)){
-						return -(parseInt(that.options.width) / 2) + '%';
-					} else {
-						return -($(this).width() / 2) + 'px';
-					}
-				});
 			}
 		
 			var prop = this.options.height ? 'height' : 'max-height';
@@ -352,4 +343,4 @@
 		});
 	});
 
-}(window.jQuery);
\ No newline at end of file
+}(window.jQuery);
diff --git a/js/bootstrap-modalmanager.js b/js/bootstrap-modalmanager.js
index 4a865f5..7d676d0 100644
--- a/js/bootstrap-modalmanager.js
+++ b/js/bootstrap-modalmanager.js
@@ -69,14 +69,12 @@
 					modal.$element.show();
 
 					if (transition) {
-						modal.$element[0].style.display = 'run-in'; 
 						modal.$element[0].offsetWidth;
-						modal.$element.one($.support.transition.end, function () { modal.$element[0].style.display = 'block' });
+						modal.$element.one($.support.transition.end, function () { modal.$element.show(); });
 					}
 
 					modal.$element
 						.toggleClass('modal-overflow', modalOverflow)
-						.css('margin-top', modalOverflow ? 0 : 0 - modal.$element.height()/2)
 						.addClass('in')
 						.attr('aria-hidden', false);
 					
@@ -367,4 +365,4 @@
 
 	$.fn.modalmanager.Constructor = ModalManager
 
-}(jQuery);
\ No newline at end of file
+}(jQuery);