main{padding-top:100px}header{position:fixed;width:100%;z-index:10000}#footer_item_wrapper{width:95%;margin:0 auto}#sns_list{padding:20px;width:100%;margin:150px auto 0;background-color:#0003}#copyright{text-align:right}#company_logo{font-size:30px}.nav-item .dropdown-menu{display:none;position:absolute;background-color:#fff}.nav-item:hover .dropdown-menu{display:block}.dropdown-item:hover{text-decoration:underline;background-color:transparent}#drop_down_item{width:0}@media screen and(max-width:450px){h1{font-size:30px}h2{font-size:28px}h3{font-size:26px}h4{font-size:24px}h5{font-size:22px}h6{font-size:20px}p{font-size:12px}.nav-item .dropdown-menu{position:static;float:none;box-shadow:none}#footer_nav_item{display:inline-block}}