html, body {
  background-color: pink;
  height: 100%;
}

header {
  margin: 30px;
  display: flex;
  height: 20%;
  justify-content: center;
}
header > img {
  height: 100%;
  margin-right: 30px;
}
header > h1 {
  font-size: 4em;
}


#termometre {
  height: 40px;
  margin-top: 10px;
}

main {
  margin: 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  text-align: center;
}

main > h1 {
  width: 100%;
}
.data {
  align-items: center;
  align-content: center;
  width: 100%;
}

.data > table {
 display: inline-block;
 border: 1px, solid, black;
}

td {
  padding: 10px;
  font-size: 1.5em;
  border: 1px, solid, black;
}

footer {
  position: fixed;
  width: 100%;
  bottom: 0;
  text-align: center;
}