body {
    font-family: 'Trebuchet MS', sans-serif;
    height: 100vh;
}

.container {
    display: flex;
    height: 100vh;
    margin: 20px;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 15px;
    border-radius: 15px;
}

.calculator-container {
    padding: 15px;
    border-radius: 30px;
    box-shadow: 8px 8px 20px rgba(0,0,0,0.25);
}

.result {
    display: flex;
    height: 35px;
    justify-content: flex-end;
    margin: 15px;
    font-size: 35px;
}

.result-bottom-line {
    margin: 15px;
}

button {
    cursor: pointer;
    width: 70px;
    height: 70px;
    border: none;
    border-radius: 50%;
    background-color: whitesmoke;
    transition: transform 0.23s ease-in;
}

button:hover {
    transform: scale(1.2);
}

.button-container-item {
    margin: 15px;
}

.number {
    color: black;
}

.operator {
    background-color: #e3e3e3;
    color: black;
}

.equalto {
    background-color: slategray;
    color: whitesmoke;
    font-weight: bolder;
}

.zero {
    grid-area: zero;
    grid-column: span 1;
}
.one {
    grid-area: one;
}
.two {
    grid-area: two;
}
.three {
    grid-area: three;
}
.four {
    grid-area: four;
}
.five {
    grid-area: five;
}
.six {
    grid-area: six;
}
.seven {
    grid-area: seven;
}
.eight {
    grid-area: eight;
}
.nine {
    grid-area: nine;
}
.plus {
    grid-area: plus;
}
.minus {
    grid-area: minus;
}
.times {
    grid-area: times;
}
.divide {
    grid-area: divide;
}

.button-container {
    display: grid;
    grid-template-areas: 
    "seven eight nine"
    "four five six"
    "one two three"
    "zero plus minus"
    "times divide equalto";
}