.main {
  width: 98%;
  max-width: 500px;
  background-color: rgb(236, 236, 236);
  margin: 20px auto;
  padding: 20px;
  box-sizing: border-box;
  border-radius: 10px;
}

h1 {
  text-align: center;
}
.select_file {
  margin-bottom: 15px;
}
.select_file::file-selector-button {
  padding: 8px 12px;
  margin-right: 10px;
  border: 1px solid #888;
  border-radius: 6px;
  cursor: pointer;
}

#result canvas {
  max-width: 100%;
  height: auto;
  display: block;
  box-sizing: border-box;
  border: 1px solid #000;
  margin-bottom: 10px;
}

#result a {
  display: block;
  margin-bottom: 30px;
}