File: styles.css

?body {
  font-family: -apple-system,system-ui,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  color: #292b2c;
  background-color: #ffffff;
}

h1, h2, h3, h4, h5, h6 {
  margin-bottom: .5rem;
  font-family: inherit;
  font-weight: 500;
  line-height: 1.1;
  color: inherit;
}

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.6rem;
}

table {
  width: 100%;
  max-width: 100%;
  margin-bottom: 1rem;
  border-collapse: collapse;
  background-color: transparent;
  display: table;
  border-collapse: collapse;
  border-spacing: 2px;
  border-color: grey;
}

thead {
  display: table-header-group;
  vertical-align: middle;
  border-color: inherit;
}

tr {
  display: table-row;
  vertical-align: inherit;
  border-color: inherit;
}

table thead th {
  vertical-align: bottom;
  border-bottom: 2px solid #eceeef;
}

table td, table th {
  padding: .75rem;
  vertical-align: top;
  border-top: 1px solid #eceeef;
}

td, th {
  display: table-cell;
  text-align: center;
}

th {
  font-weight: bold;
}

th:first-child, td:first-child {
  text-align: left;
}

table.stage th {
  width: 25%;
}

table.stage td.winner {
  color: green;
  font-weight: bold;
}

table.stage td.loser {
  color: red;
  font-weight: bold;
}

.error {
  color: red;
  font-weight: bold;
}

.total-games-avg {
  color: navy;
}

.games {
  color: royalblue;
}

.wins {
  color: green;
}

.draw {
  color: gold;
}

.losses {
  color: mediumvioletred;
}

.goals {
  color: teal;
}

.missed {
  color: mediumpurple;
}

.goals-avg {
  color: seagreen;
}

.missed-avg {
  color: mediumorchid;
}

.attack {
  color: tomato;
}

.defense {
  color: skyblue;
}

.teams {
  color: darkorange;
}

.details {
  font-size: x-small;
  color: darkgray;
}

.highlight, tr:hover td.highlight {
  background-color: black;
  color: white;
}

.total {
  font-weight: bold;
}

tr:hover td {
  background-color: cornsilk;
}

.btn {
  display: inline-block;
  font-weight: 400;
  text-align: center;
  white-space: nowrap;
  vertical-align: middle;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  border: 1px solid transparent;
  padding: .375rem .75rem;
  font-size: 1rem;
  line-height: 1.5;
  border-radius: .25rem;
  transition: background-color .15s ease-in-out,border-color .15s ease-in-out,box-shadow .15s ease-in-out;
}

.btn:focus, .btn:hover {
    text-decoration: none;
}

.btn-primary {
  color: #ffffff;
  background-color: #007bff;
  border-color: #007bff;
}

.btn-primary:hover {
  color: #ffffff;
  background-color: #0069d9;
  border-color: #0062cc;
}

.btn-primary.focus, .btn-primary:focus {
  box-shadow: 0 0 0 0.2rem rgba(0,123,255,.5);
}

.hidden {
  display: none;
}