body {
  margin: 0;
  padding: 0;
  position: relative;
}

header {
  position: fixed;
  width: 100%;
  padding: 15px;
  top: 0;
  left: 0;

  display: flex;
  justify-content: space-between;
  z-index: 100;

  box-sizing: border-box;
  box-shadow: 0 10px 10px lightblue;

  background-color: white;
}

header > img {
  aspect-ratio: initial;
  height: 50px;
}

/*https://getcssscan.com/css-buttons-examples button 6*/

nav > a {
  align-items: center;
  justify-content: center;

  background-color: #ffffff;

  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 0.25rem;

  box-shadow: rgba(0, 0, 0, 0.02) 0 1px 3px 0;
  box-sizing: border-box;

  color: rgba(0, 0, 0, 0.85);
  cursor: pointer;
  display: inline-flex;

  font-family:
    system-ui,
    -apple-system,
    system-ui,
    "Helvetica Neue",
    Helvetica,
    Arial,
    sans-serif;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.25;

  margin: 0;
  min-height: 3rem;
  padding: calc(0.675rem - 1px) calc(1.2rem - 1px);
  position: relative;
  text-decoration: none;
  transition: all 250ms;
  user-select: none;
  vertical-align: baseline;
  width: auto;

  animation: 0.5s;
}

.current-tab {
  background-color: #bbbbbb !important;
}

nav > a:hover {
  background-color: #eeeeee;
}

nav {
  display: flex;
  gap: 20px;
  justify-content: space-between;
}

main {
  margin-top: 100px;
}

table {
  border: 1px solid black;
  border-collapse: collapse;
  gap: 0;
}

td {
  width: 33%;
}

td,
th {
  border: 1px solid black;
  padding: 0;
  text-align: center;
}

td.great {
  background-color: green;
}

td.sad {
  background-color: red;
}

td.ok {
  background-color: yellow;
}