* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  font-family: "Roboto Mono", monospace;
}

body {
  height: 100vh;
  font-size: 16px;
  background: linear-gradient(to bottom, #f9544c 50%, #090c31 50%);
}
.calculator {
  position: absolute;
  top: 50%;
  left: 50%;
  box-shadow: 0 20px 50px rgba(0, 5, 24, 0.4);
  width: 400px;
  background-color: #15173c;
  color: white;
  padding: 50px 30px;
  border-radius: 6px;
  -webkit-border-radius: 6px;
  -moz-border-radius: 6px;
  -ms-border-radius: 6px;
  -o-border-radius: 6px;
  transform: translate(-50%, -50%);
  -webkit-transform: translate(-50%, -50%);
  -moz-transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  -o-transform: translate(-50%, -50%);
}

.display {
  width: 100%;
}

input[type="text"] {
  width: 100%;
  text-align: right;
  padding: 15px 10px;
  border: none;
  color: #ffffff;
  background-color: transparent;
  font-size: 2.1875rem;
}

input[type="text"]::-webkit-outer-spin-button,
input[type="text"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.display input::placeholder {
  color: #9490ac;
}

.buttons {
  display: grid;
  grid-template-columns: repeat(4, minmax(30px, 1fr));
  grid-template-rows: repeat(5, minmax(30px, 1fr));
  gap: 20px;
  margin-top: 40px;
}

.buttons input[type="button"] {
  padding: 1.0625rem;
  font-size: 1.4rem;
  background-color: transparent;
  border: none;
  color: white;
  cursor: pointer;
  transition: 0.3s;
  -webkit-transition: 0.3s;
  -moz-transition: 0.3s;
  -ms-transition: 0.3s;
  -o-transition: 0.3s;
  border-radius: 6px;
  -webkit-border-radius: 6px;
  -moz-border-radius: 6px;
  -ms-border-radius: 6px;
  -o-border-radius: 6px;
}

.buttons input[type="button"]:hover {
  transform: translateY(-5px);
  -webkit-transform: translateY(-5px);
  -moz-transform: translateY(-5px);
  -ms-transform: translateY(-5px);
  -o-transform: translateY(-5px);
  box-shadow: 0 1px 150px gray;
}

#equal {
  background-color: #f9544c !important;
  grid-row: span 2;
}

.zero-btn {
  grid-column: span 2;
}

input:focus {
  outline: none;
  border: none;
}

@media (max-width: 450px) {
  .calculator {
    width: 250px;
    padding: 10px;
  }
  .buttons input[type="button"] {
    padding: 0;
  }
  .buttons input[type="button"]:focus {
    transform: none;
    -webkit-transform: none;
    -moz-transform: none;
    -ms-transform: none;
    -o-transform: none;
    box-shadow: none;
  }
}

/*
.calculator {
  width: 400px;
  background-color: #15173c;
  padding: 50px 30px;
  position: absolute;
  transform: translate(-50%, -50%);
  top: 50%;
  left: 50%;
  border-radius: 8px;
  box-shadow: 0 20px 50px rgba(0, 5, 24, 0.4);
}
.display {
  width: 100%;
}
.display input {
  width: 100%;
  padding: 15px 10px;
  text-align: right;
  border: none;
  background-color: transparent;
  color: #ffffff;
  font-size: 35px;
}
.display input::placeholder {
  color: #9490ac;
}
.buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-gap: 20px;
  margin-top: 40px;
}
.buttons input[type="button"] {
  font-size: 20px;
  padding: 17px;
  border: none;
  background-color: transparent;
  color: #ffffff;
  cursor: pointer;
  border-radius: 5px;
}
.buttons input[type="button"]:hover {
  box-shadow: 0 8px 25px #000d2e;
}
input[type="button"]#equal {
  grid-row: span 2;
  background-color: #f9544c;
}
input[type="button"][value="0"] {
  grid-column: span 2;
} */