body {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: crimson;
    color: white;
    font-family: sans-serif;
}

.main {
    padding: 5px 0;
    text-align: center;
}

input {
    display: flex;
    flex-direction: column;
}

.inputs input {
    border: none;
    border-radius: 5px;
    padding: 1rem 10rem;
    outline: none;
    margin-bottom: 10px;
}

#selectOp {
    margin-bottom: 10px;
    padding: 10px;
    outline: none;
}

#btn {
    border: none;
    background: transparent;
    color: white;
    padding: 10px 20px;
    border: 2px solid white;
    margin-top: 10px;
    cursor: pointer;
}

.calculator {
    position: relative;
    display: grid;
}

.calculator .value {
    grid-column: span 4;
    height: 100px;
    text-align: right;
    border: none;
    outline: none;
    padding: 10px;
    font-size: 18px;
}

.calculator span {
    display: grid;
    width: 60px;
    height: 60px;
    background: #292929;
    place-items: center;
    border: 1px solid rgba(0, 0, 0, 0.1);
    color: #fff;
}

.calculator span:active {
    background: rgb(255, 163, 26);
    color: #fff;
}

.calculator span.clear {
    grid-column: span 2;
    width: 120px;
    background: rgb(255, 163, 26);
    /* color: #fff; */
}

.calculator span.plus {
    grid-row: span 2;
    height: 120px;
}

.calculator span.equal {
    background: rgb(255, 163, 26);
    /* background: #03b1ff; */
}