form {
    text-align: center;
}

input[type="submit"] {
    font-size: 100%;
    font-weight: bold;
    width: 150px;
    height: 40px;
    border: none;
    margin-top: 10px;
    border: solid 1px #223a70;
    color: #ffffff;
    background-color: #223a70;
    border-radius: 5px;
    cursor: pointer;
    font-family: 'Zen Kaku Gothic New', sans-serif;
}

th,.null {
    width: 155px;
}

input[type="submit"]:hover{
    background-color: #fff;
    border: solid 1px #223a70;
    color: #223a70;
}

div {
    margin-top: 15px;
    text-align : center ;
}

th {
    color: #000;
    text-align: right;
    font-size: 120%
}

table {
    margin-right: auto;
    margin-left: auto;
    table-layout: fixed;
}

fieldset {
    display: block;
    margin-top: 50px;
    margin-left: auto;
    margin-right: auto;
    border: none;
    width: 800px;
    padding-left: 50px;
    padding-right: 50px;
    margin-bottom: 50px;
}


#number , #name , #tel {
    width: 300px;
    font-size: 20px;
    font-family: 'Zen Kaku Gothic New', sans-serif;
}

@media (max-width: 800px) {
    #number, #name, #tel {
        width: 210px;
        text-align: left;
    }

    input[type="submit"] {
        font-size: 23px;
    }

    .null {
        width: 0px;
    }

    th {
        font-size: 18px;
    }

}