body {
  background: rgb(242, 239, 254);
}
h1 {
  text-align: center;
}
h2 {
  width: 90%;
  margin: 30px auto 20px;
  text-align: center;
  border: 1px solid rgb(210, 210, 210);
  border-radius: 8px;
  box-shadow: 10px 10px 30px rgba(0, 0, 0, 0.1), -15px -15px 30px #fff;
}
section {
  width: 480px;
  padding: 15px;
  margin: 50px auto;
  border: 1px solid rgb(210, 210, 210);
  border-radius: 20px;
  box-shadow: 10px 10px 30px rgba(0, 0, 0, 0.1), -15px -15px 30px #fff;
}
table {
  margin: 0 auto;
  width: 360px;
}
table .th {
  background: #fff;
  border: 1px solid #333;
}
td {
  text-align: center;
  border: 1px solid #333;
}
.randomNumber {
  position: relative;
  background: #333;
  width: 95%;
  height: 200px;
  margin: 30px auto;
  border-radius: 20px;
  display: flex;
  justify-content: center;
  text-align: center;
}

.randomNumber .wrapper {
  position: absolute;
  width: 100%;
  bottom: 30px;
  display: flex;
  justify-content: center;
  align-items: center;
}
#Rnum {
  position: absolute;
  top: 30px;
  left: 50%;
  transform: translateX(-50%);
  color: #fff;
  font-size: 2rem;
}
.Rbtn {
  display: block;
  width: 90px;
  height: 40px;
  font-size: 1.5em;
  margin-right: 20px;
  border-radius: 7px;
}
input {
  text-align: center;
}
.Rbtn2 {
  display: block;
  width: 60px;
  height: 40px;
}

@media (max-width: 480px) {
  section {
    width: 360px;
    padding: 5px;
  }
  table {
    width: 330px;
  }
  td {
    padding: 2px;
    font-size: 14px;
  }
  h2 {
    font-size: 1.3rem;
  }
}