#start_page {
  margin: 0;
  position: fixed;
  display: flex;
  width: 100%;
  height: 100%;
  z-index: 10000000;
}

.side {
  width: 35%;
  height: 100vh;
  background-color: #842239; /* cor das laterais */
}

#center {
  width: 40%;
  height: 100vh;
  background-color: #651226; /* A cor que não aparecia */
  display: flex;
  justify-content: center;
  align-items: center;
}

#start_page_img {
  width: 350px;
}