body {
  margin: 0;
  font-family: Arial;
  background: #0b0b10;
  color: white;
  text-align: center;
}

header {
  padding: 40px 20px 10px;
}

.category {
  width: 340px;
  margin: 14px auto;
  background: rgba(255,255,255,0.06);
  border-radius: 16px;
  padding: 16px;
  cursor: pointer;
}

.items {
  max-height: 0;
  overflow: hidden;
  transition: 0.3s;
}

.category.open .items {
  max-height: 400px;
}

.item {
  background: rgba(255,255,255,0.08);
  margin: 6px;
  padding: 10px;
  border-radius: 10px;
}

.form-box {
  width: 340px;
  margin: 20px auto;
  padding: 16px;
  background: rgba(255,255,255,0.06);
  border-radius: 16px;
}

input {
  width: 90%;
  padding: 10px;
  margin: 6px;
  border-radius: 10px;
  border: none;
}

button {
  padding: 10px;
  margin: 6px;
  border-radius: 10px;
  border: none;
  cursor: pointer;
}

.submit {
  width: 100%;
  background: #3a7bfd;
  color: white;
}