*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: monospace;
}
:root{
    --bgColorDark: rgba(0,0,0,0.8);
    --transparentWhite: rgba(255,255,255,.4);
    --pureWhite: rgb(255,255,255);
}
body{
    height: 100vh;
    width: 100vw;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bgColorDark);
}
.container{
    border: solid 2px var(--transparentWhite);
    height: 600px;
    width: 500px;
    border-radius: 8px;
    background-color: var(--transparentWhite);
    position: relative;
}
.display{
    height: 180px;
    width: 97%;
    border: solid 1px var(--transparentWhite);
    background-color: aqua;
    margin: 5px auto;
    border-radius: 8px;
    position: relative;
    padding: 10px;
}
.userInput{
    font-size: 1.5rem;
    position: absolute;
    right: 5%;
    font-weight: 700;
    border-right: solid .5px black;
    line-height: 2;
    padding-right: 1px;
    animation: blinkCursor .5s alternate infinite;
    max-width: 90%;
    overflow: hidden;
}
@keyframes blinkCursor{
    0%{
        border-color: black;
    }
    100%{
        border-color: transparent;
    }
}
.answer{
    position: absolute;
    bottom: 2%;
    right: 5%;
}
.keys{
    height: 390px;width: 97%;
    border: solid 1px var(--bgColorDark);
    margin: 5px auto;
    border-radius: 8px;
    padding: 10px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.numKeys{
    width: 70%;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 20px;
}
.keyStyle{
    width: 62px;
    height: 62px;
    border: solid .5px var(--bgColorDark);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}
.signKeys{
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
.nums{
    background-color:var(--bgColorDark);
    color: var(--pureWhite);
    font-weight: 700;
    cursor: pointer;
}
.nums:active{
    transform: translateY(1px);
    color: var(--transparentWhite);
}
.sign{
    background-color:var(--transparentWhite);
    color: var(--bgColorDark);
    font-weight: 700;
    cursor: pointer;
}
.sign:active{
    transform: translateY(1px);
}
.equals{
    background-color: orange;
    color: white;
}
.brand{
    color: gray;
    bottom: 5%;
    position: absolute;
    font-family: cursive;
    opacity: 30%;
    cursor: default;
}
@media (max-width: 500px) {
    .container{
        border: none;
    }
    .display{
        width: 100%;
    }
    .keys{
        width: 100%;
    }
}