CSS Fakebook

#logo {
    display: block;
    margin-left: auto;
    margin-right: auto;
}
#header {
    text-align: center;
}
body {
    background-color: #3B5997;
    color: white;
    font-family: "Calibri", Calibri;
}
section {
    width: 80%;
    margin-left: auto;
    margin-right: auto;
    padding-top: 30px;
}
fieldset {
    border-radius: 15px;
    display: inline;
}
    input {
        border-radius: 4px;
    }
        .input {
            width: 180px;
            margin: 5px;
            height: 30px;
            border-radius: 4px;
        }
        .details {
            border-radius: 4px;
            height: 30px;
            width: 90px;
            margin: 5px;
        }
        #textarea {
            width: 100%;
            height: 78px;
        }
        #bday {
            width: 220px;
            height: 30px;
        }

        #btn-clear {
            background-color: lightgrey;
            color: #3B5997;
            height: 40px;
            width: 420px;
            font-size: 25px;
            font-weight: bold;
            border-radius: 7px;
        }
        #btn-submit {
            background-color: lightgrey;
            color: #3B5997;
            width: 600px;
            margin: 20px;
            height: 40px;
            font-size: 25px;
            font-weight: bold;
            border-radius: 7px;
        }