@font-face {
    font-family: 'Roboto';
    font-display: swap;
    font-style: normal;
    font-weight: 400;
    src: url('roboto.woff2') format('woff2');
  }
*{
    font-family: 'Roboto', sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    outline: 0;
    -webkit-tap-highlight-color: transparent;
}
body{
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: end;
    height: 100dvh;
}
.display{
    width: 90%;
    max-width: 300px;
}
input{
    text-align: right;
    width: 100%;
    height: 4rem;
    font-size: 2rem;
    border: none;
    outline: none;
    caret-color: #2B840C;
}
#key{
    display: grid;
    width: 90%;
    max-width: 300px;
    gap: 0;
    aspect-ratio: 4/5;
    place-items: center;
    grid-template-columns: repeat(4, 1fr);
}
hr{
    border-color: #F6F6F6;
}
button{
    height: 4rem;
    aspect-ratio: 1/1;
    border: none;
    background: #F6F6F6;
    color: #4D4D4D;
    font-size: 2rem;
    border-radius: 50%;
    cursor: pointer;
}
button:active{
    font-size: 1.7rem;
    transition: .1s;
    background: #C6C6C6;
}
.func{
    color: #2B840C;
    font-weight: bold;
}