body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: #0f0f0f;
  color: #fff;
  overflow: hidden;
}

canvas#particles {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}

.card {
  background: #1e1e1e;
  padding: 20px;
  margin: 20px auto;
  width: 90%;
  max-width: 400px;
  border-radius: 12px;
}

.shadow {
  box-shadow: 0 0 15px red;
}

input, button {
  width: 100%;
  padding: 10px;
  margin-top: 10px;
  border: none;
  border-radius: 6px;
}

button {
  background: red;
  color: white;
  cursor: pointer;
}

button:hover {
  background: darkred;
}

.hidden {
  display: none;
}

.profile {
  width: 60px;
  border-radius: 50%;
  margin-bottom: 10px;
}

.header {
  text-align: center;
  padding-top: 20px;
}

.dropdown {
  position: relative;
}

.dropdown-content {
  position: absolute;
  background: #333;
  width: 100%;
  z-index: 1;
}

.dropdown-content div {
  padding: 10px;
  cursor: pointer;
}

.dropdown-content div:hover {
  background: #555;
}

footer {
  text-align: center;
  margin-top: 30px;
  color: red;
}