body {
  margin: 0;
  padding: 0;
  background: #1f1f1f;
  color: #f0f0f0;
  font-family: Arial, sans-serif;
}
.form-box, .panel-box {
  background: #2d2d2d;
  margin: 50px auto;
  padding: 30px;
  border-radius: 10px;
  max-width: 600px;
  box-shadow: 0 0 15px rgba(255,255,255,0.1);
}
.form-box input,
.form-box textarea,
.form-box button {
  display: block;
  width: 100%;
  margin-top: 10px;
}
.panel-box h2 {
  margin-top: 0;
}
.msg-card {
  background: #3a3a3a;
  padding: 15px;
  margin-bottom: 20px;
  border-radius: 8px;
}
.msg-card h3 {
  margin: 0 0 10px;
}
.actions a {
  display: inline-block;
  margin-right: 10px;
  padding: 8px 12px;
  background: #00bcd4;
  color: #fff;
  text-decoration: none;
  border-radius: 5px;
}
.actions a:hover {
  background: #008fa1;
}
.erro { color: #f33; }
.btn-logout {
  float: right;
  background: #f44336;
  padding: 8px 12px;
  color: #fff;
  text-decoration: none;
  border-radius: 5px;
}