* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Rubik Mono One", monospace;
  transition: 300ms;
}
body {
  height: 100dvh;
  width: 100dvw;
  background-color: #313131;
  display: flex;
  align-items: center;
  justify-content: center;
}
.container {
  background-color: #292929;
  border-radius: 12px;
  border: 4px solid #191919;
  height: 70dvh;
  min-width: 30dvw;
  display: flex;
  flex-direction: column;
}

#screenSection {
  display: grid;
  grid-template-columns: 3fr 1fr;
  align-items: center;
  justify-items: center;
  flex: 1;
}
#screen {
  width: 80%;
  padding-right: 5%;
  border-radius: 12px;
  text-align: right;
  background-color: white;
  color: #131313;
}

#keySection {
  flex: 2;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  align-items: center;
  justify-items: center;
}

input {
  width: 70px;
  height: 70px;
  border: 2px solid #bdbdbd;
  border-radius: 50%;
  outline: none;
  font-size: 1.5rem;
  /* font-weight: 800; */
  color: #bdbdbd;
  background-color: #131313;
}
.btn:active {
  transform: scale(0.8);
  background-color: #cccccccc;
  color: #131313;
}
.oprater {
  background-color: #ff8f1f;
  color: #131313;
}
.oprater:active {
  background-color: #131313;
  color: #bdbdbd;
}
#equal {
  background-color: #ff6200;
}
#darkMode {
  visibility: hidden;
}
.darkMode {
  position: absolute;
  top: 2rem;
  left: 4rem;
}
.toggleBtn {
  display: flex;
  align-items: center;
  position: relative;
  cursor: pointer;
  cursor: pointer;
  width: 4rem;
  height: 2rem;
  border-radius: 18px;
  border: 2px solid #121212;
  background-color: #b6b6b6;
  transition: 300ms;
}

.toggleBtn ::before {
  position: absolute;
  position: relative;
  content: "";
  height: 2rem;
  width: 2rem;
  border-radius: 50%;
  transition: 300ms;
  margin-left: 0.5rem;
}

.fa-moon {
  position: absolute;
  left: 2rem;
  color: #b6b6b6;
}

#darkMode:checked + .toggleBtn {
  background-color: black;
  border: 2px solid #b6b6b6;
}
@media (max-width: 600px) {
  .container {
    width: 80dvw;
  }
  .darkMode {
    position: absolute;
    top: 0.5rem;
    left: 4rem;
  }
}