html, body {
    margin: 0;
    height: 100vh;
    overflow: hidden;
}

.corpo {
    border: 1px solid black;
    margin: 0 auto;
    width: 18.75rem;
    height: 31.25rem;
    padding: 0.2rem;
    -webkit-box-shadow: 30px 27px 22px -10px rgba(0,0,0,0.75);
    -moz-box-shadow: 30px 27px 22px -10px rgba(0,0,0,0.75);
    box-shadow: 30px 27px 22px -10px rgba(0,0,0,0.75);
    background-color: rgb(7, 7, 7);
    margin-bottom: 2rem;
}

.container {
    width: 100vw;
    height: 100vh;
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
}

.display {
    width: 100%;
    height: 20%;
    border: 1px solid black;
    border-radius: 3px;
    margin-bottom: 1px;
    padding: 1px;
    box-shadow: inset 2px 2px rgb(255, 255, 255)
}

.teclas {
    width: 100%;
    height: 80%;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    padding: auto;
    border: 1px solid rgb(20, 20, 20);
}

.tecla {
    width: 25%;
    height: 20%;
    border: 1px solid rgb(20, 20, 20);
    border-radius: 2px;
    color: silver;
    font-size: x-large;
    font-weight: bold;
}

#resultado {
    margin-bottom: 1rem;
    height: auto;
}

p {
    text-align: right;
    font-size: 3rem;
    color: white;
    text-shadow: -1px -1px 5px black, 1px 1px 5px black;
    margin-right: 0.5rem;
    margin-bottom: 0;
}
#operacao {
    height: 20%;
    font-size: 1rem;
}

.app {
    background-image: linear-gradient(to top left,#1be4e8, #b6e5e6);
}

.tecla:hover {
    background-color: gray!important;
}

.tecla:active {
    background-color: rgb(59, 59, 59)!important;
}

.mini {
    position: absolute;
    font-size: 0.9rem;
}

.miniFooter {
    position: absolute;
    z-index: 1;
    bottom: 8px;
    right: 16px;
    background-color: cornflowerblue;
    border-radius: 10px;
    box-shadow: 0.3rem 0.3rem 0.7rem black;
    max-height: 5rem;
}

.miniFooter p {
    color: white;
    font-size: 1rem;
    margin: 0.5rem 0.5rem 0.5rem 0.5rem;
}

.miniFooter img {
    max-width: 2rem;
}

.links {
    margin: 0.5rem 1rem;
    max-height: 2rem;
    justify-content: space-around;
    display: flex;
}

button:focus {outline:0;}