body{
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    height: 100vh;
    background-color: hsl(0, 0%, 100%);
    margin: 0;
    font-family: Arial, sans-serif;
}

.title {
    display: inline-block;
    margin-bottom: 80px;
    font-size: 1.2em;
    margin-top: 50px;
}

.main{
    color: rgb(8, 8, 88);
    font-weight: bold;
    font-size: 1.5em;
}

.sub{
    color: hsl(328, 100%, 48%);
    font-weight: bold;
    font-size: 1em;
    font-style: italic;
}

.calculator{
    width: 250px;
    background-color: hsl(0, 0%, 100%);
    border: 1px solid rgba(0, 0, 0, 0.548);
    border-radius: 10px;
    box-shadow: 0 0 10px rbga(0, 0, 0, 0.1);
    margin: 0px;
    padding: 10px;
    padding-bottom: 20px;
}

.calculator-screen{
    width: 230px;
    display: flex;
    height: 50px;
    border: 1px solid rgba(0, 0, 0, 0.548);
    border-radius: 2px;
    background-color: #f8f6f6;
    color: #000000;
    text-align: right;
    font-size: 1.5em;
    padding: 10px;
    margin-bottom: 20px;
    margin-top: 10px;
    word-wrap: break-word;
    word-break: break-all;
    justify-content: space-around;
    flex-direction: column;
    align-items: flex-end;
}

.calculator-buttons{
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-gap: 6px;
}

.btn{
    height: 42px;
    padding: 2px;
    border: 1px solid rgba(0, 0, 0, 0.548);
    border-radius: 20%;
    background-color: hsla(0, 2%, 88%, 0.695);
    font-size: 1.5em;
    cursor: pointer;
    transition: background-color 0.3s;
}

.btn:active{
    background-color: hsl(0, 0%, 90%);
}

.operator{
    background-color: hsl(35, 100%, 50%);
    color: #170101;
}

.operator:active{
    background-color: #f7c987;
}

.equal-sign{
    background-color: hsl(117, 100%, 50%);
    color: #090101;
    grid-column: span 1;
}

.equal-sign:active{
    background-color: hsla(117, 100%, 60%);
}

.all-clear{
    background-color: hsl(3, 100%, 50%);
    color: #0c0606;
    grid-column: span 1;
}

.all-clear:active{
    background-color: hsl(0, 91%, 59%);
}

.clear{
    background-color: rgb(255, 54, 36);
}

.clear:active {
    background-color:  rgb(243, 89, 75);
}

.ans{
    background-color: rgb(87, 206, 242);
}