body{
    margin:0 auto;
    width:50%;
}
.content{
    width:50%;
    margin:80px auto;
    text-align: center;
}
.content h3{
    font-weight: normal;
}
.btn{
    margin:10px auto;
   width:200px;
   height:50px;
   font-size:14px;
   line-height:50px;
   color: white;
   display: block;
    text-decoration: none;
   border-radius:5px;
   background-color: darkgreen;
}
@media only screen and (max-width: 480px){
    
    body{
        width: 80%;
    }
    .content{
        width:100%;
    }
    
    .content h3{
        
    }
}