* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    font-family: "Roboto", sans-serif;
}

body {
    background-image: linear-gradient(to right, #1565c0, #0d47a1);
}

.calculadora {
    position: absolute;
    background-color: rgba(0, 0, 0, 0.9);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 30px;
    border-radius: 5px;
    transition: 0.8s;
}

.calculadora:hover {
    cursor: pointer;
    -webkit-box-shadow: 5px 5px 15px 5px #000000;
    box-shadow: 5px 5px 15px 5px #000000;
}

.botao {
    width: 50px;
    height: 50px;
    font-size: 25px;
    transition: 0.5s;
    background-color: #333;
    margin: 3px;
    color: #fff;
    border: none;
}

.botao:hover {
    cursor: pointer;
    background-color: #1f1f1f;
}

#resultado {
    background-color: #fff;
    width: 215px;
    height: 38px;
    margin: 5px;
    font-size: 25px;
    color: #333;
    text-align: right;
    padding: 3px;
}

.text-header {
    background-image: linear-gradient(to bottom, pink, #bd4494, turquoise);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    color: black;
}
.button-play{
    background-color: rgb(181, 39, 39);
    color: #fff;
    border: none;
}
.button-play:hover{
    background-color: red;
}
.button-play:disabled{
    background-color: gray;
    cursor: auto;
    color: #aaa;
}