html {
    overflow-x: hidden;
}

/* ヘッダー */
header{
    width:100%;
    background:#ffffff;
}
header > div{
    width:1080px;
    margin:0 auto;
    padding:10px 0;
}
.header-image{
    width:200px;
}
header > div > span{
    margin-left:20px;
}

/* フッター */
footer{
    background:#333333;
    color:#ffffff;
    padding:10px;
    text-align:center;
    display:block;
    font-size:12px; 
    overflow-x: hidden;
}

div.site_seal {
    display: flex;
    justify-content: center;
    background: #fff;
    gap: 10px;
}

div.site_seal div.site_seal_left {
    padding: 40px 0px
}

div.site_seal div.site_seal_right {
    padding: 40px 0px
}