body {
  margin: 0px;
}


.abt-box {
  width: 60vw;
}

.abt-content {
  background-color: antiquewhite;
  padding: 20px;
}

summary {
  width: 100svw;
  background-color: antiquewhite;
  padding: 10px;
}

summary::marker {
  content: "";
}