body,div{margin:0; padding:0}
ul,li{list-style:none; margin:0; padding:0}
a{text-decoration:none; margin:0; padding:0}
img {border:0; margin:0; padding:0;}

#m_container {width:100%; max-width:640px; min-width:320px; margin:0 auto;}
#m_container .m_header {background-color:#fff; overflow:hidden;}
#m_container .m_header .head_logo {width:100%; }
#m_container .m_header .head_btn_wrap {overflow:hidden; margin-bottom:15px;}
#m_container .m_header .head_btn_wrap li{float:left; width:20%; margin:0 2.5%}