body {
    background-color: #EEE;
    }

    #container {
    width: 900px;
    margin-left: auto;
    margin-right: auto;
    }

    #header {
    color: #2ca089;
    text-align: center;
    font-size: 2em;
    }

    /* links */

    a:link, a:visited {
    background-color: #2ca089;
    color: white;
    padding: 5px 12px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
}

a:hover, a:active {
background-color: #AFDCB1;
}

#btn_add {
padding: 5px 0px;
text-align: right;
}

table {
    border-collapse: collapse;
    width: 100%;
    }

    th, td {
    text-align: left;
    padding: 8px;
    }

    tr:nth-child(even){background-color: white; }
    th {
    background-color: #2ca089;
    color: white;
    }