.box{
    background-color: white;
    text-align: center;
}

.main{
    margin-top: 65px;
    background-color: white;
    padding:3%;
}

@media(max-width:640px){
    /*  スマホ  */
    .box{
        margin: 2%;
    }
    .headline1{
        font-size: 28px;
    }
    .headline2{
        font-size: 13px;
    }
    .pc-only{
        display: none;
    }
    
}
@media(min-width:641px){
    /*  パソコン  */
    .box{
        margin: 3%;
    }
    .headline1{
        font-size: 30px;
    }
    .headline2{
        font-size: 18px;
    }
   
    .sp-only{
        display: none;
    }
}