header,
main,
footer {

    display: flex;
    flex-flow: column;
    align-items: center;
    justify-content: center;
    max-width: 500px;
    margin: 0 auto;
}

h1 {
    text-align: center;
}

table,
th,
td {
    border-collapse: collapse;
    max-width: 450px;
}

thead {
    background-color: #7fb9c2;
    font-size: 35px;
    font-weight: bold;
    padding-top: 10px;
    padding-bottom: 10px;
    color: black;
}

.subheading {
    font-size: 20px;
    text-align: center;
    background-color: #628ca6;
    color: white;
    padding-top: 10px;
    padding-bottom: 10px;
    font-weight: bold;
}

table,
td,
th {

    border: 2px lightgray solid;
    border-collapse: collapse;
    padding: 15px;
    margin: 10px;
}

table {
    box-shadow: 9px 9px 25px #628ca6;
}

body {
    font-family: 'Ubuntu', 'sans serif';
    text-align: center;
    color: black;
}

tfoot {
    text-align: center;
    background-color: #7fb9c2;
    font-size: 15px;
    font-weight: bold;
    color: black;
}

table {
    width: 100%;
}

tr:nth-child(even) {
    background-color: #e7ffed;
}
tr:nth-of-type(3) {
    background-color: #e7f0ed;
}
tr:nth-of-type(5) {
    background-color: #e7f0ed;
}
tr:nth-of-type(7) {
    background-color: #e7f0ed;
}