style.css

* {
  box-sizing: border-box;
  margin: 0;
  transition: all 0.3s;
}

body {
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  display: flex;
  background-color: black;
}
.boxparenret {
  background-color: black;

  padding: 15px;
  flex-wrap: wrap;
  gap: 15px;
  justify-content: center;
  align-items: center;
  width: 80vh;
  height: 80vh;
  border-radius: 10px;
  display: flex;
}
.box {
  border-radius: 10px;
  width: calc(30%);
  height: calc(30%);
  background-color: #fff;
  display: flex;
}
.contanerbtn {
  display: flex;
  padding: 15px;
  flex-wrap: wrap;
  gap: 15px;
  justify-content: center;
  align-items: center;
  width: 80vh;
  height: 80vh;
}
.butens {
  font-family: "Gill Sans", "Gill Sans MT", Calibri, "Trebuchet MS", sans-serif;
  background-color: goldenrod;
  display: flex;
  align-items: center;
  justify-content: center;
  width: calc(50%);
  height: calc(50%);
  font-size: 60px;
  border: 0;
  border-radius: 15px;
}
.backdoor {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 5vh;
  height: 5vh;
  background-color: rgb(200, 200, 200);
  border: 0;
}
.hide {
  display: none;
}