.clearfix,
#gmenu,
#mainarea,
#indexbox-area,
.index-box,
.footer-inner,
.header-sub,
.header-sns ul,
.main-footer,
.top-information,
.footer-subbtn,
.content-inner,
.student-voice,
.student-voice-inner {
zoom:1;/*for IE 5.5-7*/
}

.clearfix:after,
#gmenu:after,
#mainarea:after,
#indexbox-area:after,
.index-box:after,
.footer-inner:after,
.header-sub:after,
.header-sns ul:after,
.main-footer:after,
.top-information:after,
.footer-subbtn:after,
.content-inner:after,
.student-voice:after,
.student-voice-inner:after {/*for modern browser*/
content:".";
display: block;
height:0px;
clear:both;
line-height:0;
visibility:hidden;
}