body{
    margin: 0%;
    padding: 0%;
    background-color: aqua;
    background: linear-gradient(to right, rgb(57, 57, 228), rgb(13, 197, 13));
}
.container {
    /* border: .4rem solid black; */
    background-color: cadetblue;
    width: fit-content;
    margin: auto;
    border-radius: .3rem;
}
.window {
    width: 6rem;
}
.output-part {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr ;
}
button {
    height: 2rem;
    width: 3rem;
    display: flex;
    background-color: rgb(241, 209, 161);
    margin: .2rem;
    text-align: center;
    justify-content: center;
    align-items: center;
    border-radius: .4rem;
}
button:hover {
    color: blue;
    background-color: rgb(243, 226, 201);
    font-size: 1.4rem;
}
#output{
    height: 5rem;
    width: 13.4rem;
    border-radius: .4rem;
    color: white;
    font-size: 1.2rem;
    background-color: rgb(55, 4, 104);
    border: 2px solid black;
    display: flex;
    align-items: flex-end;
    flex-direction: column;
}
.btn {
   grid-column: 1 / span 2;
   width: 6.4rem;
}
.current-part {
    font-size:  2rem;
}