.stemupload input {
    width: 100%;
    display: block;
    padding: 8px 10px;
    margin: 14px 0px;
    font-size: 14px;
    border-radius: 5px;
}
.btn-submit {
    background: #3b5998;
    cursor: pointer;
    color: #fff;
    font-size: 18px;
    width: 100%;
    padding: 10px 20px;
    border: 1px solid #3b5998;
    border-radius: 5px;
    margin: 0px auto;
}
.stemupload {
    max-width: 400px;
    width: 100%;
    margin: 0px auto;
}