body {
  font-family: Arial, sans-serif;
  background: #fff;
  margin: 0;
  padding: 0;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 20px;
}

h1 {
  text-align: center;
  margin-bottom: 50px;
}

p {
  text-align: center;
}

.donate-box {
  display: none;
  width: 350px;
  background-color: #f0f0f0;
  border-radius: 12px;
  padding: 20px;
  margin: 0 auto;
  margin-bottom: 50px;
  text-align: center;
  box-shadow: 0 2px 6px rgba(0,0,0,0.05);
}

.donate-box h2 {
  margin-top: 0;
  font-size: 1.3em;
}

.donate-box p {
  margin: 10px 0 0;
  font-size: 1.1em;
}

.input-block {
  text-align: center;
  margin-bottom: 50px;
}

.input-block img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto 20px auto;
}

.input-block label {
  display: inline-block;
  font-size: 1em;
}

.input-block input,
.input-block select {
  padding: 6px;
  margin-left: 10px;
  width: 50px;
  font-size: 1em;
}

.input-block input[type="checkbox" i] {
  width: 20px;
}

.input-pair {
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 0px;
}

.checkbox {
  text-align: center;
}

button {
  padding: 10px 30px;
  background-color: #28a745;
  color: white;
  border: none;
  font-size: 1em;
  cursor: pointer;
  border-radius: 4px;
}

button:hover {
  background-color: #218838;
}

.output-block {
  text-align: center;
  display: flex;
  justify-content: center;
  gap: 40px;
  margin: 50px 0px 100px 0px;
}

.output-block input {
  width: 60px;
  text-align: center;
  font-weight: bold;
  font-size: 1em;
}

.text-block p {
  text-align: left;
}

@media (max-width: 600px) {

  .donate-box {
    width: auto;
  }

  .input-pair {
    flex-direction: column;
    align-items: center;
  }

  .output-block {
    flex-direction: column;
    gap: 15px;
  }
}