body {
  background-color: blueviolet;
  background-image: url(https://pbs.twimg.com/profile_images/1212057237243518977/SkTp06ZA_400x400.jpg);
  background-repeat: no-repeat;
  background-size: cover;
}

.container {
}

#archivos {
  background-color: rgba(172, 60, 255, 0.7);
  color: white;
  top: 30%;
  width: 70%;
  min-height: 30%;
  position: absolute;
  margin-left: auto;
  margin-right: auto;
  border-radius: 50px;
}

#archivos form {
  margin-left: auto;
  margin-right: auto;
}

#archivos label {
  font-size: 4em;
}

#upload {
  background-color: #d18aff;
  height: 7rem;
  font-size: 3rem;
  color: white;
}

#submit {
  background-color: #9b00ff;
  color: white;
  font-size: 4rem;
  font-weight: bold;
}

#submit:hover {
  background-color: #58048e;
}