.contact input[type="text"],
    input[type="email"],
    input[type="number"],
    textarea {
        border-radius: 7px;
    }
    
    .contact input[type="submit"],
    input[type="reset"] {
        border-radius: 7px;
    }
    
    #comments {
        display: flex;
    }
    
    .contenu {
        float: left;
        margin-right: 200px;
    }
    
    @media screen and (max-width: 720px) {
        #comments {
            display: inline;
            margin-top: 100px;
        }
        .contenu {
            margin-bottom: 100px;
        }
    }