html {
  min-height:100%;
  background: 
    url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" style="background-color: black;writing-mode: tb: glyph-orientation-vertical: 0; writing-mode: vertical-rl; text-orientation: upright;" viewBox="0 0 1 140"><text x="0" y="25" fill="%23FF0000" >アンタが俺のたった一人恋</text></svg>') 
    0 0/100px 300px; /* update the 50px 50px to control the size */
  display: flex;
  justify-content: center;   /* Centers horizontally */
  align-items: center;       /* Centers vertically */
}
.memory {
  font-family: "DotGothic16", sans-serif;
  font-weight: 400;
  font-style: normal;
  background-color: red;
  max-width: 50%;
  margin: auto auto 21px auto;
  padding: 21px 21px 21px 21px
}
.header {
  text-align: center;
}
.date {
  text-align: end;
  padding-top: 21px;
}