css fixes to post window on mobile screens

public/css/style.less

@@ -503,7 +503,6 @@ body .navbar .nodebb-inline-block {
 
 .post-window {
 	position: fixed;
-	bottom: 45px;
 	display: none;
 	height: 350px;
 	visibility: hidden;
@@ -559,6 +558,7 @@ body .navbar .nodebb-inline-block {
 			resize: none;
 			color:white;
 			font-size:20px;
+
 			div {
 				margin-right:10px;
 			}
@@ -570,13 +570,18 @@ body .navbar .nodebb-inline-block {
 				padding-left:5px;
 			}
 		}
-		
 	}
 }
 
 @media (max-width: 979px) {
 	.post-window {
+		position: relative;
+		bottom: 0px !important;
+
+		> div {
 			position: static;
+			width: 100% !important;
+		}
 	}
 }