body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #000;
  color: white;
  overflow: hidden;
}

/* canvas */
canvas {
  position: fixed;
  top: 0;
  left: 0;
  z-index: -1;
}

/* centered content */
.content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  text-align: center;
}

/* button (your original style preserved) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #000000;
  color: #ffffff;

  width: 360px;
  height: 140px;

  font-size: 18px;
  font-weight: bold;
  text-transform: uppercase;
  text-decoration: none;

  border-radius: 25px;
  border: 3px solid #ff2a2a;

  transition: 0.3s;
}

.btn:hover {
  border-color: #ff2a2a;
  box-shadow: 0 0 25px #ff2a2a;
  color: #ff2a2a;
}

/* TW SCREEN */
#twScreen {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
}

.box {
  text-align: center;
  padding: 30px;
  border: 2px solid #ff2a2a;
  box-shadow: 0 0 25px #ff2a2a;
  border-radius: 10px;
}

.box h1 {
  color: #ff2a2a;
}

#enterBtn {
  margin-top: 10px;
  padding: 10px 20px;
  background: black;
  color: #ff2a2a;
  border: 1px solid #ff2a2a;
  cursor: pointer;
}

#enterBtn:hover {
  box-shadow: 0 0 15px #ff2a2a;
}