body {
    margin: 0;
    background-color: #555;
    font-size: 24px;
}

button {
    border: 1px solid #999;
    outline: none;
    background-color: #000;
    color: #fff;
}

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

.calc-cont {
    border: 3px solid #000;
}

#calc-input {
    text-align: right;
    font-size: 24px;
    height: 42px;
    outline: none;
    border: none;
}

#calc-btn {
    width: 100%;
}

.btn-cont {
    display: flex;
    height: 48px;
    width: 100%;
    font-size: 24px;
}

.op-btn {
    background-color: rgb(141, 19, 240);
    width: 30%;
    font-size: 24px;
    text-align: center;
}

.right-cont {
    display: flex;
    width: 100%;
}

.clear-btn,
.num-btn {
    width: 100%;
    height: 100%;
    font-size: 20px;
}

.op-btn:hover,
.num-btn:hover,
.clear-btn:hover,
.float-btn:hover {
    cursor: pointer;
}

.float-btn {
    font-size: 20px;
    width: 48.5%;
}