body {
    padding:0px;
    margin:0px;
}
.tstage {
  display: flex;
  justify-content: center; /* Horizontal center */
  align-items: center;     /* Vertical center */
  
  width: 100%;
  height: 100vh;           /* Takes up 100% of the viewport height */
  background-color: #f0f0f0; 
}
.textbox {
  font-family: sans-serif;
  line-height: 1.6;
  /* Respects the line breaks in your HTML */
  white-space: pre-wrap; 
  /* Starts hidden to avoid a "flash" of text before JS runs */
  opacity: 0; 
  transition: opacity 0.3s ease;
  justify-content: center;
  align-items: center;
}