body {
  background: #F3904F;  /* fallback for old browsers */
  background: -webkit-linear-gradient(to right, #3B4371, #F3904F);  /* Chrome 10-25, Safari 5.1-6 */
  background: linear-gradient(to right, #3B4371, #F3904F); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
}

.container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.block {
  /*width: 200px;
  height: 200px;
  line-height: 200px;
  background-color: #3498db;
  color: #fff;*/
  text-align: center;
  font-size: 14px;
}

/* @media (max-width: 768px) {
  .block {
    width: 150px;
    height: 150px;
    line-height: 150px;
  }
} */

input[type="text"] {
  padding: 8px;
  margin-right: 10px;
  border: 1px solid #ccc;
  border-radius: 4px;
  font-size: 16px;
}

button {
  padding: 8px 16px;
  border: none;
  border-radius: 4px;
  background-color: #007bff;
  color: #fff;
  font-size: 16px;
  cursor: pointer;
}

button:hover {
  background-color: #0056b3;
}

#spinner {
  display: none;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

#response {
  margin-top: 20px;
  text-align: left;
}