Update w3.css (EliasKotlyar#1713)

Make html, body & w3-auto elements 100% height. Add flex and flex direction to w3-auto. Make the content element grow to fill available space.

firmware_mod/www/lib/w3css/w3.css

@@ -24,7 +24,7 @@ legend{color:inherit;display:table;max-width:100%;padding:0;white-space:normal}t
 [type=search]::-webkit-search-decoration{-webkit-appearance:none}
 ::-webkit-file-upload-button{-webkit-appearance:button;font:inherit}
 /* End extract */
-html,body{font-family:Verdana,sans-serif;font-size:15px;line-height:1.5}html{overflow-x:hidden}
+html,body{font-family:Verdana,sans-serif;font-size:15px;line-height:1.5,height:100%}html{overflow-x:hidden}
 h1{font-size:36px}h2{font-size:30px}h3{font-size:24px}h4{font-size:20px}h5{font-size:18px}h6{font-size:16px}.w3-serif{font-family:serif}
 h1,h2,h3,h4,h5,h6{font-family:"Segoe UI",Arial,sans-serif;font-weight:400;margin:10px 0}.w3-wide{letter-spacing:4px}
 hr{border:0;border-top:1px solid #eee;margin:20px 0}
@@ -79,7 +79,7 @@ hr{border:0;border-top:1px solid #eee;margin:20px 0}
 .w3-col.l5{width:41.66666%}.w3-col.l6{width:49.99999%}.w3-col.l7{width:58.33333%}.w3-col.l8{width:66.66666%}
 .w3-col.l9{width:74.99999%}.w3-col.l10{width:83.33333%}.w3-col.l11{width:91.66666%}.w3-col.l12{width:99.99999%}}
 .w3-rest{overflow:hidden}.w3-stretch{margin-left:-16px;margin-right:-16px}
-.w3-content,.w3-auto{margin-left:auto;margin-right:auto}.w3-content{max-width:980px}.w3-auto{max-width:1140px}
+.w3-content,.w3-auto{margin-left:auto;margin-right:auto}.w3-content{max-width:980px}.w3-auto{max-width:1140px;height:100%;display:flex;flex-direction:column}#content{flex:1}
 .w3-cell-row{display:table;width:100%}.w3-cell{display:table-cell}
 .w3-cell-top{vertical-align:top}.w3-cell-middle{vertical-align:middle}.w3-cell-bottom{vertical-align:bottom}
 .w3-hide{display:none!important}.w3-show-block,.w3-show{display:block!important}.w3-show-inline-block{display:inline-block!important}
@@ -229,4 +229,4 @@ hr{border:0;border-top:1px solid #eee;margin:20px 0}
 .w3-border-light-grey,.w3-hover-border-light-grey:hover,.w3-border-light-gray,.w3-hover-border-light-gray:hover{border-color:#f1f1f1!important}
 .w3-border-dark-grey,.w3-hover-border-dark-grey:hover,.w3-border-dark-gray,.w3-hover-border-dark-gray:hover{border-color:#616161!important}
 .w3-border-pale-red,.w3-hover-border-pale-red:hover{border-color:#ffe7e7!important}.w3-border-pale-green,.w3-hover-border-pale-green:hover{border-color:#e7ffe7!important}
-.w3-border-pale-yellow,.w3-hover-border-pale-yellow:hover{border-color:#ffffcc!important}.w3-border-pale-blue,.w3-hover-border-pale-blue:hover{border-color:#e7ffff!important}
+.w3-border-pale-yellow,.w3-hover-border-pale-yellow:hover{border-color:#ffffcc!important}.w3-border-pale-blue,.w3-hover-border-pale-blue:hover{border-color:#e7ffff!important}