* {
      padding: 0;
      margin: 0;
      box-sizing: border-box;
      outline: 0;
      transition: all 0.5s ease;
}

body {
      font-family: sans-serif;
}

a {
      text-decoration: none;
      color: #fff;
}

body {
      background-image: linear-gradient(to bottom right, rgba(79, 51, 176, 1.0), rgba(210, 53, 165));
}

.container {
      height: 100vh;
      width: 100vw;
      display: grid;
      place-items: center;
}
.container h1{
      font-family: Georgia, 'Times New Roman', Times, serif;
      font-size: 40px;
}

.calculator {
      position: relative;
      height: auto;
      width: auto;
      padding: 20px;
      border-radius: 10px;
      box-shadow: 0 0 30px #000;
}

.theme-toggler {
      position: absolute;
      top: 30px;
      right: 30px;
      color: #fff;
      cursor: pointer;
      z-index: 1;
}

.theme-toggler.active {
      color: #333;
}

.theme-toggler.active::before {
      background-color: #fff;
}

.theme-toggler::before {
      content: '';
      height: 30px;
      width: 30px;
      position: absolute;
      top: 50%;
      transform: translate(-50%, -50%);
      border-radius: 50%;
      background-color: #333;
      z-index: -1;
}

#display {
      margin: 0 10px;
      height: 150px;
      width: auto;
      max-width: 270px;
      display: flex;
      align-items: flex-end;
      justify-content: flex-end;
      font-size: 30px;
      margin-bottom: 20px;
      overflow-x: scroll;
}

#display::-webkit-scrollbar {
      display: block;
      height: 3px;
}

button {
      height: 60px;
      width: 60px;
      border: 0;
      border-radius: 30px;
      margin: 5px;
      font-size: 20px;
      cursor: pointer;
      transition: all 200ms ease;
}

button:hover {
      transform: scale(1.1);
}

button#equal {
      height: 130px;
}

/* light theme */

.calculator {
      background-color: #fff;
}

.calculator #display {
      color: #0a1e23;
}

.calculator button#clear {
      background-color: #ffd5d8;
      color: #fc4552;
}

.calculator button.btn-number {
      background-color: #c3eaff;
      color: #000000;
}

.calculator button.btn-operator {
      background-color: #ffd0fb;
      color: #f967f3;
}

.calculator button.btn-equal {
      background-color: #adf9e7;
      color: #000;
}

/* dark theme */

.calculator.dark {
      background-color: #071115;
}

.calculator.dark #display {
      color: #f8fafb;
}

.calculator.dark button#clear {
      background-color: #2d191e;
      color: #bd3740;
}

.calculator.dark button.btn-number {
      background-color: #1b2f38;
      color: #f8fafb;
}

.calculator.dark button.btn-operator {
      background-color: #2e1f39;
      color: #aa00a4;
}

.calculator.dark button.btn-equal {
      background-color: #223323;
      color: #ffffff;
}