body {
    font-family: arial, sans-serif;
    background-color: #EFF7FD;
    font-family: 'Armata', cursive, sans-serif;
}
h1 {
    text-align: center;
    font-size: 30px;
    padding: 10px 0;
    color: #00707F;
}

.container {
    width: 800px;
    margin: 0 auto;
    border: 2px solid #00707F;
    border-radius: 7px;
    padding: 20px;
    background-color: #FFFFFF;
}
.file-input {
    width: 355px;
    border: 1px solid #00707F;
    padding: 10px;
    border-radius: 7px;
    display: inline-block;
    background-color: #EFF7FD;
}
.file-input:first-of-type {
    margin-right: 40px;
}
.file-submit {
    text-align: center;
    padding-top: 20px;
}
#submit {
    padding: 15px 20px;
    background-color: #00707F;
    color: #FFFFFF;
    border-radius: 4px;
    border: 1px solid #ccc;
    font-size: 16px;
}
#submit:hover {
    background-color: #00899D;
}

#data_table {
    margin: 0 auto;
    text-align: center;
    border: 3px solid #DCE6EF;
    background-color: #FFFFFF;
}
#data_table thead {
    background-color: #DCE6EF;
}
#data_table thead tr th {
    height: 50px;
    padding: 20px;
}
#data_table tbody tr:nth-child(2n+2) {
    background-color: #DCE6EF;
}
#btn_back {
    width: 100px;
    text-align: center;
    display: block;
    padding: 5px;
    margin: 30px auto 0;
    color: #00707F;
    text-decoration: none;
    font-size: 22px;
    border: 1px solid #00707F;
    border-radius: 10px;
}
#btn_back:hover {
    background-color: #DCE6EF;
}