* {
    box-sizing: border-box;
}

*:before,
*:after {
    box-sizing: border-box;
}

html,
body {
    font-family: Arial, Helvetica, sans-serif;
    height: 100%;
    position: relative;
    margin: 0px;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
}

.table-striped>tbody>tr:nth-child(odd)>td,
.table-striped>tbody>tr:nth-child(odd)>th {
   background-color: #D3D3D3; // Choose your own color here
 }