.intro_first { width:100%; height:400px; background:#000; }
.first_cell { width:25%; }

.head_login { border-bottom:1px solid #03647d; }
.dark_btn { border:1px solid #03647d; }

.section_quarter { padding:50px 0; }
.quarter { width:25%; float:left; padding:30px 15px; }
.icon_quarter { font-size:100px; }


@media screen and (max-width:940px){
	.quarter { width:50%; }
}
@media screen and (max-width:640px){
	.quarter { width:100%; }
}

.custom_av { width:40px; height:40px; }
.custom_av img { width:40px; height:40px; border-radius:50%; }
.custom_option { width:40px; height:40px; text-align:center; font-size:18px; }