@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@100;300;400&display=swap');

* {
  margin: 0;
  padding: 0;
  font-family: 'Poppins';
}

:root {
  --linear-gradient: linear-gradient(45deg, #808080, #d3d3d3, #00bfff);
}

#container {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background: var(--linear-gradient);
  color: #ffffff;
}

#calculator {
  background: #2e2e2e;
  box-sizing: border-box;
  padding: 40px;
  border-radius: 5px;
}

#calculator h2 {
  padding-bottom: 10px;
  font-size: 30px;
  position: relative;
}

#calculator h2::before {
  position: absolute;
  content: '';
  height: 3px;
  width: 150px;
  background: var(--linear-gradient);
  bottom: 5px;
}

label {
  padding: 5px;
}

.input-field {
  display: flex;
  flex-direction: column;
  padding: 5px;
}

.input-field input {
  font-size: 25px;
  color: #ffffff;
  background-color: transparent;
  border: none;
  border-bottom: 1px solid #00bfff;
}

.input-field input:focus {
  outline: none;
}

#result {
  text-align: center;
  padding: 10px;
  font-size: 50px;
}

button {
  width: 100%;
  align-items: center;
  border-radius: 10px;
  font-size: 20px;
  background: var(--linear-gradient);
  cursor: pointer;
  padding: 5px;
}