body {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Times New Roman', Times, serif;
}

.container {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
}

.calculator {
    box-shadow: 0 0 25px 0 rgba(0, 0, 0, 0.264);
    padding: 20px;
    border-radius: 5px;
    width: 500px;
}

.calculator_display {
    height: 35%;
    margin-bottom: 1em;
}


.calculator_display {
    width: 100%;
    box-sizing: border-box;
    padding: 30px;
    text-align: right;
    border: 1.5px solid #efefef;
    height: 35%;
    margin-bottom: 1em;

}

.calculator_display:active,
.calculator_display:hover,
.calculator_display:focus {
    border: 1.5px solid #efefef;
    outline: none;
    cursor: pointer;
}

.calculator_keys {
    height: 60%;
    display: grid;
    grid-template-columns: repeat(4, auto);
    gap: 20px 15px;
    grid-template-areas:
        ". . . ."
        "seven eight nine equal"
        "four five six equal"
        "one two three equal"
        "zero dot clear equal";
}

.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;
}

.zero {
    grid-area: zero;
}

.dot {
    grid-area: dot;
}

.equal {
    grid-area: equal;
    background-color: hsl(217.93deg 98.86% 65.49%);
    border: 1.6px solid hsl(217.93deg 98.86% 65.49%);
    color: white;
}

.clear {
    grid-area: clear;
}

button {
    border: 1.6px solid #d5d3d3;
    padding: 15px 0;
    color: rgb(65, 64, 64);
    font-size: 1.8rem;
    outline: none;
    border-radius: 1px inset;
    background-color: hsl(0deg 0% 86.67%);
    cursor: pointer;
}

.btn,
.btns {
    background-color: transparent;
}