#contentsArea {
    overflow-x: hidden;
}
#contentsArea #vietnam{
    background: url(../images/bg_vietnam.jpg);
    background-size: cover;
    text-align: center;
}
#contentsArea #vietnam section{
    max-width: 1120px;
    margin: 0 auto;
    text-align: center;
    padding: 27px 0 110px;
}
#contentsArea #vietnam section h1{
    margin-bottom: 100px;
}
#contentsArea #vietnam section .catch{
    margin-bottom: 142px;
}
#contentsArea #vietnam section .btn{
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
}
#contentsArea #vietnam section .btn a img:hover{
    opacity: 0.8;
}