How to add new style to style.css

<style type="text/css">
<!--
.style1 {
   font-size: large;
   font-weight: bold;
}
-->
</style>

/*Phos Theme for PHPFusion 7 by Max "Matonor" Toball*/

/*General*/
html {font-size: 75%;}
body {
   color: #3d3d3d;
}
* {
   font-family: Verdana, Arial, Sans, sans-serif;
   margin: 0;
   padding: 0;
   border: 0;
   font-size: 1em;
}
ul, ol, dl {margin: 0.5em 1em}
li {margin-left: 1.5em; line-height: 1.5em;}
option {padding-left: 0.75em}
#subheader ul, #subheader li, #userbar ul, #userbar li, #navigation ul, #navigation li {margin: 0; line-height: inherit;}

/*Links*/
a {text-decoration: none;}
#subheader a, #links a{
   color: #fff;
   text-decoration: none;
}
#subheader a{
   display: block;
   float: left;
   color: #242424;
   margin: 0 0.4em;
   background: #969696 url(images/navtab_bg.jpg) repeat-x top right;
}
* html #subheader a {margin: 0 0.2em;}
#subheader a span{
   display: block;
   float:left;
   height: 2em;
   line-height: 2em;
   padding: 0 0.5em;
   background: transparent url(images/navtab_l.jpg) no-repeat top left;
}
#subheader a:hover, #subheader .active a{
   background: #d1d1d1 url(images/navtab_hbg.jpg) repeat-x top right;
}
#subheader a:hover span, #subheader .active span{
   background-image: url(images/navtab_hl.jpg);
}
#links a{
   line-height: 1.6em;
   height: 1.6em;
   font-size: 0.9em;
   margin-right: 0.3em;
}
#links a:hover {
   color: #ccc;
}
#footer a {
   color: #fff;
}


#anchors a {
   line-height: 1.6em;
   font-size: 1em;
   color: #444;
   margin-left: 0.5em;
}
#anchors a:active, #anchors a:focus, #anchors a:hover{color: #fff;}
.admin-message a{
   color: #fff;
   text-decoration: underline;
}



/*Structure*/
#header{
   padding: 13px 13px 0 13px;
}
#header_bg{
   position: relative;
   background: #242424 url(images/header_bg.jpg) no-repeat bottom right;
}
#subheader{
   float: left;
   height: 1.9em;
   overflow: hidden;
}
#subheader ul{
   display: table;
   white-space: nowrap;
   right: 0 !important;
   padding: 0 !important;
}
#subheader li{
   display: table-cell;
}
#mainheader{
   padding: 0.5em;
}
#userbar{
   height: 1.8em;
   position: relative;
   font-family: "Trebuchet MS", "Lucida Grande", sans-serif;
}
#userbar ul li, #subheader ul li {
   float: left;
   list-style: none;
}
#links{
   position: absolute;
   right: 0.5em;
   top: 0;
}
#tab{
   position: absolute;
   right: -13px;
   bottom: 0;
   margin-top: 0.1em;
   width: 210px;
   height: 23px;
   background: transparent url(images/tab_l.gif) repeat-x bottom left;
}
#tab_r{
   height: 23px;
   line-height: 23px;
   padding: 0 1em;
}
#footer {
   width: 90%;
   color: #ccc;
   border: 1px solid #ccc;
   margin: 1.5em auto;
   padding: 1em;
   font-size: 0.8em;
}
#subfooter{
   width: 90%;
   margin: 0.5em auto;
   color: #fff;
   font-size: 0.8em;
}
#main {
   left: 0;
   position: absolute;
   top: 10px;
}
#cont{
   margin: 0 1em 1em 1em;
   background: #d1d1d1;
}
#corner_bl{padding-bottom: 5px;}
*+html #corner_bl{padding-bottom: 0em; overflow: hidden;}
* html #corner_bl{padding-bottom: 0;}
#main-bg {
   line-height: 1.45em;
   padding: 1em 0.25em;
}
* html #main-bg, * html #cont{
   height: 1%;
   width: auto;
   background: transparent;
}
#side-border-left {
   width: 15em;
   max-width: 15em;
   padding: 1em 0.75em;
   float: left;
   display: inline;
}
#side-border-right {
   width: 15em;
   max-width: 15em;
   padding: 1em 0.75em;
   float: right;
   display: inline;
}
.side-both #main-bg {margin: 0 16.5em;}
.side-left #main-bg {margin: 0 0.5em 0 16.5em;}
.side-right #main-bg {margin: 0 16.5em 0 0.5em;}


/*Navigation Panel*/
#navigation{ margin: -0.4em; }
#navigation h2, .side-label {
   color: #fff;
   font-size: 1.1em;
   padding: 0.25em;
   margin-bottom: 1px;
   font-weight: 700;
}
#navigation ul {
   margin: 0;
   display: block;
   list-style-type: none;
   line-height: 1.2em;
}
#navigation .bullet {display: none;}
* html #navigation ul li, #navigation a {height: 1%;}
#navigation a {
   background-color: #ede9e4;
   display: block;
   text-decoration : none;
   margin-bottom: 1px;
}
#navigation a span{
   color: #fff;
   display: block;
   height: 1.7em;
   line-height: 1.7em;
   padding: 0 0.5em;
}
#navigation a:hover {color: #fff;}


/*Misc Styles*/

.pagenav {padding: 0.4em;}
.pagenav span, .pagenav a, .pagenav a:hover {
   color: #ccc;
   border: 1px solid #ccc;
   padding: 0.2em 0.4em 0.2em 0.4em;
   margin: 0.2em;
   text-decoration: none;
}
.pagenav a {
   color: #333;
}
.switcherbutton{
   height: 16px;
   width: 16px;
}
.panelbutton{
   margin: 0.5em 0;
}
.textbox, .button {
   border-width: 1px;
   font-size: 1em;
   margin-top: 0.1em;
   padding: 0.25em;
}
.textbox{
   border-style: inset;
}
.button{
   color: #fff;
   border-style: outset;
   font-weight: bold;
}
.bbcode{
   background: #f0f0f0;
   border: 1px solid #ccc;
}
.news-category {
   float: left;
   margin: 0.2em 0.5em 0 0;
}
.news-footer-img {vertical-align: middle;}
.panelcap {
   font-family: "Trebuchet MS", "Lucida Grande", sans-serif;
   color: #fff;
   font-size: 1.2em;
   line-height: 1.75em;
   display: block;
   height: 1.75em;
   font-weight: 500;
   background: #242424 url(images/panelcap_bg.jpg) repeat-x top;
}
.panelcap span {
   display: block;
   background: transparent url(images/panelcap_r.jpg) no-repeat top right;
}
.panelcap span span {
   display: block;
   padding: 0 0.75em;
   background: transparent url(images/panelcap_l.jpg) no-repeat top left;
}
.navcap_r{
   margin: -1px -1px 0 0;
   background: transparent url(images/navcap_r.jpg) no-repeat top right;
}
.navcap_l{
   margin: -1px 0 0 -1px;
   background: transparent url(images/navcap_l.jpg) no-repeat top left;
}
.panelbody {
   z-index: 1000;
   background: #f7f7f7 url(images/panelbody_bg.jpg) repeat-x bottom;
   margin-bottom: 1em;
   border-bottom: 1px solid #b0b0b0;
   border-left: 1px solid #fff;
   border-right: 1px solid #c7c7c7;
}
.panel_r{
   margin: 0 -1px -1px 0;
   background: transparent url(images/panelbody_r.jpg) no-repeat bottom right;
}
.navcap_r .panel_r{margin: 0 0 -1px 0;}
.panel_l{
   margin: 0 0 -1px -1px;
   padding: 0.75em;
   background: transparent url(images/panelbody_l.jpg) no-repeat bottom left;
}
.navcap_l .panel_l{margin: 0 0 -1px 0;}
.quote,.admin-message {
   border: 1pt solid #999;
   margin: 0 2em;
   padding: 3pt;
}
.admin-message{
   color: #fff;
   padding: 0.5em;
   margin: 1em auto;
   width: 80%;
}
code, pre {
   font-family: monospace;
   font-size: 1.1em;
}
.poll {height: 1em; border: 1px solid #000; background: #333;}
.shoutboxname, .comment-name {font-weight: 700;}
.shoutboxdate {
   color: #888;
   font-size: 0.8em;
}
.small,.small2,.side-small {font-size: 0.9em;}
.tbl-border{
   background: #f5f2eb;
   border: 1px solid #f5f2eb;
}
.tbl,.tbl1,.tbl2,.forum-caption {padding: 3pt;}
.forum-caption {
   color: #666;
   font-variant: small-caps;
   font-weight: 700;
   background: #ddd;
}
.tbl1 {background: #e6e6e6;}
.tbl2 {background: #e1e1e1;}
.tbl3 {background: #e1e1e1;}
hr {
   border: solid #999 1pt;
   height: 1pt;
}
.news-footer {padding: 0.5em;}
.panelbutton{float: right;}
h1,h2,h3,h4,h5,h6 {font-size: inherit;}


/*Helpers*/
.center {margin: 0 auto;}
.content_center {text-align: center;}
.flleft {float: left !important;}
.flright {float: right !important;}
.clear {clear: both;}

#container{
   width: 100%;
   overflow-x: auto;
   overflow-y: visible;
}

/*IE Fixes*/
* html #main-bg {
   height: 1%;
   width: auto;
}
.clearfix:after {
   content:".";
   display:block;
   height:0;
   clear:both;
   visibility:hidden;
}
/* Hide from IE Mac \*/
.clearfix {display:block;}
/* End hide from IE Mac */
.floatfix {overflow:hidden;}
* html .floatfix {width:100%;}
.center, *[align="center"] {margin: 0 auto;}