body {
  font-family: Arial, sans-serif;
  background-color: #23252E;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  background: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  text-align: center;
}

h1 {
  margin-bottom: 20px;
}

input[type="text"] {
  width: 70%;
  padding: 10px;
  margin-bottom: 10px;
  border: 1px solid #ccc;
  border-radius: 4px;
}

input[type="text"]:focus {
  border-color: #277EE2;
  outline: none;
}

button {
  padding: 10px 20px;
  background-color: #277EE2;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  box-shadow: 0px 0px 10px #277EE2;
}

#error {
  color: red;
  width: 50%;
  margin-top: 8px;
  box-shadow: 0px 0px 10px rgba(255, 0, 0, 0.268);
  background-color: rgba(255, 0, 0, 0.121);
  border-radius: 4px; 
  margin: auto;
  margin-top: 10px;
}

#country-codes {
  width: 50%;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 4px;
  background-color: #fff;
  font-size: 16px;
  color: #333;
  appearance: none;
  background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="10" height="10" viewBox="0 0 10 10"><polygon points="0,0 10,0 5,5" fill="%23333"/></svg>');
  background-repeat: no-repeat;
  background-position: right 10px center;
  background-size: 10px;
  cursor: pointer;
  margin-bottom: 10px;
}

#country-codes:focus {
  border-color: #277EE2;
  outline: none;
}

#country-codes option {
  color: #999;
}