* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Poppins", sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background: #203240;
}

.calculatrice {
  width: 300px;
  background: #203240;
  border-radius: 50px;
  padding: 10px;
  box-shadow: 25px 25px 75px rgb(0, 0, 0, 0.25),
    10px 10px 70px rgb(0, 0, 0, 0.25),
    inset 5px 5px 10px rgb(255, 255, 255, 0.2),
    inset -5px -5px 15px rgb(0, 0, 0, 0.75);
}
#ecran {
  display: flex;
  justify-content: end;
  align-items: end;
  background: #0c1c26;
  color: #2fc900;
  height: 100px;
  width: 100%;
  font-size: 30px;
  font-weight: 500;
  padding-right: 10px;
  border-radius: 40px 40px 10px 10px;
  box-shadow: inset 0px 1px 0px #7d7c7e, 0px 1px 0px #7d7c7e,
    inset 0px -1px 0px #0c0c0c;
  border: 2px solid #070f14;
  overflow-x: hidden;
  user-select: none;
}

.buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-gap: 15px;
  margin: 40px 5px 10px;
  place-items: center;
}

.buttons .button {
  position: relative;
  color: #2fc900;
  cursor: pointer;
  border: 2px solid #08141c;
  font-size: 20px;
  font-weight: 500;
  border-radius: 50%;
  height: 50px;
  width: 50px;
  display: flex;
  justify-content: center;
  align-items: center;
  user-select: none;
}

#equal {
  color: #2d506a;
  background: #2fc900;
}
#equal:hover {
  box-shadow: 0.4rem 0.4rem 1rem #2fc900 inset,
    -0.4rem -0.4rem 1rem #80f33e inset;
}
.buttons .button:hover {
  box-shadow: 0.4rem 0.4rem 1rem #1c1c1c inset,
    -0.4rem -0.4rem 1rem #2d506a inset;
}

.buttons .button::before {
  position: absolute;
  content: "";
  height: 50px;
  width: 50px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: inherit;
  box-shadow: inset 0px 1px 0px #7d7c7e;
}