/* RESET GERAL */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}

body {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background: url("https://png.pngtree.com/thumb_back/fh260/background/20230707/pngtree-web-development-concept-3d-illustrated-programming-and-coding-image_3766213.jpg") no-repeat;
    background-size: cover;
   
   
}

.fundo h1 {
   color: rgb(133, 138, 138);
   position: absolute;
   top: 5%;
   font-size: 2.5rem;
   text-shadow: rgba(94, 94, 245, 0.877);
}

.calculadora {
    background: #494747c0;
    padding: 1rem;
    border-radius:  10px;
    box-shadow: 3px 3px white;
}

.calculadora h2 {
    color: rgb(8, 8, 8);
    text-align: center;
}

#resultado {
    background-color: #fff;
    color: black;
    height: 2rem; 
    text-align: right;
    padding: .2rem .5rem;
    font-size: 1.8rem;
    border-radius: 5px;
    margin: 1rem auto 1rem;
    overflow: hidden;
    width: 14rem;
}

button {
    width: 3rem;
    height: 3rem;
    font-size: 1.25rem;
    cursor: pointer;
    font-weight: 600;
    margin: .3rem;
    box-shadow: 3px 3px black;
    border-radius: 5px;
}

button:hover {
    background-color: rgba(98, 167, 144, 0.308);
    color: black;
}

td[rowspan="2"] button {
    background-color: rgb(153, 147, 147);
    height: 108px;
    color: #fff;
}

td[colspan="2"] button {
    width: 6.75rem;
}

button:active {
    font-size: 1rem;
    transform: scale(-90%);
}