*{
  margin: 0;
  scroll-behavior: smooth;
}

#section1{
  height: 400px;
  display: flex;
  flex-direction: column;
  text-align: center;
  align-items: center;
  justify-content: center;
  width: 100%;
  background-color: aqua;
}

#toutpdf{
  justify-content: center;
  display: flex;
  flex-wrap: wrap;
}

div{
  border: 2px black solid;
  height: 300px;
  width: 300px;
  text-align: center;
  justify-content: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

a{
  margin: 20px;
  vertical-align: middle;
  background-color: blue;
  height: 10px;
  border-radius: 15px;
  padding: 20px;
  padding-bottom: 30px;
  color: white;
  width: 80px;
  border: 1px solid black;
}