body , html {
    height: 100%;
    font-family: Helvetica Neue",Arial,"Hiragino Kaku Gothic ProN","Hiragino Sans",Meiryo,sans-serif;
    width:100%; /*ページ全体の幅は100%と指定する*/	
    text-align:center; /*ページ全体を中央揃えにする*/
    color:#333333;
    min-width:960px;
    margin-left:0; 
}

#contents {
    padding-bottom: 70px;
margin:0; 
}


 
#nav_wrap {
    position: fixed;
    bottom: 0;
    width: 100%;
    height: 70px;
margin:0; 
border-width: medium;
border-color: #dcdcdc;
border-top-style: solid; 1px;
	background-color:#FFFFFF;
    min-width:960px;
}


#nav_wrap2 {
    position: fixed;
    top: 0;
    width: 100%;
    height: 70px;
margin:0; 
border-width: medium;
border-color: #dcdcdc;
border-top-style: solid; 1px;
	background-color:#FFFFFF;
    min-width:960px;
}


#nav_left ul{
    padding: 0px; 	
    margin: 0px;
    list-style:none;
} 
#nav_left ul li {
    /*display: inline;*/	
	float:left;
} 
#nav_left ul li a { 
    text-decoration: none; 	 
} 


#nav_right ul{
    padding: 0px; 	
    margin: 0px;
    list-style:none;
} 
#nav_right ul li {
    /*display: inline;*/	
	float:right;
} 
#nav_right ul li a { 
    text-decoration: none; 	 
}

#content_main{ 
  width: 960px;	   /*全体の幅を指定する*/  
  margin: 0 auto;    /*マージンの指定をする、ブラウザ対策*/
  text-align:left;   /*全体を左揃えにする。*/
}



.form_text{
border:0;
padding:10px;
font-size:1.3em;
font-family:Arial, sans-serif;
color:#aaa;
border:solid 1px #ccc;
margin:0 0 20px;
width:100%;
}

.form_btn{
border:solid 1px #ccc;
padding:15px 30px;
margin:0 0 20px;
font-family:Arial, sans-serif;
font-size:1.2em;
text-transform:uppercase;
font-weight:bold;
background-color:#000033;
cursor:pointer;
text-align:center;
color:#FFF;
}

h3 {
color: #000033;/*文字色*/
border-bottom: dashed 2px #000033;
/*線の種類（点線）2px 線色*/
}

<p>
line-height:150%;
</p>