.title {
  font-family: Tahoma;
  text-align: center;
}

.main_visual {
  width: 100%;
  height: auto;
}

.DLbutton {
  border-radius: 100vh;
  background-color: blue;
  padding: 10px;
  padding : 20px 20px;
  width: 250px;
  color:white;
  text-decoration: none;
  display: inline-block;
  line-height: 1rem;
  text-align: center;
  box-shadow: 1px 1px 1px 1px black;
  transition: 0.1s ease;
}

.DLbutton:hover {
  background-color: rgb(32, 32, 255);
  color: white;
  box-shadow: 2.5px 2.5px 2.5px 2.5px black;
}

@media (max-width:800px){
  iframe {
    width: 100%;
  }
}