* {
    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: url("flower.jpg");
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.container {
    height: 100vh;
    width: 100vw;
    display: grid;
    place-items: center;
}

.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;
    cursor: pointer;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: inherit'
}

.theme-toggler::before {
    content: '';
    height: 35px;
    width: 35px;
    border-radius: 50%;
    position: absolute;
    z-index: -1;
}

.calculator.dark .toggler-icon {
    color: #F3C3C5;
}

.calculator:not(.dark) .toggler-icon {
    color: #C3CA92;
}

.toggler-icon {
    transition: transform 0.3s ease;
}

.theme-toggler:active .toggler-icon {
    transform: rotate(180deg);
}

.display-screen {
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: flex-end;
    padding-top: 40px;
    height: 150px;
}

.display-content {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    width: 100%;
    height: 100%;
    justify-content: flex-end;
}

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

#history {
    margin: 0 10px 5px 2px;
    font-size: 14px;
    color: #888;
    text-align: right;
    min-height: 20px;
}

#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: 60px;
}

/* flower theme */

.calculator {
    background-color: #FADAD9;
}

.calculator #display {
    color: #C65C69;
}

.calculator button#clear, .calculator button.btn-operator {
    background-color: #fff;
    color: #CE6F79;
}

.calculator button.btn-number {
    background-color: #E9ABAE;
    color: #C65C69;
}
  
.calculator button.btn-equal {
    background-color: #FCDB6D;
    color: #C65C69;
}

  /* dark theme */

.calculator.dark {
    background-color: #C3CA92;
}

.calculator.dark #display {
    color: #354C2B;
}

.calculator.dark button#clear, .calculator.dark button.btn-operator {
    background-color: #fff;
    color: #354C2B;
}

.calculator.dark button.btn-number {
    background-color: #A4B178;
    color: #4E6530;
}