*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
     background-image: url(./picture46.avif);
     background-repeat: no-repeat;
     background-size: cover;     
}

.container {
    border: 5px solid rgb(139, 115, 7);
    border-radius: 20px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 30vw;
    height: 70vh;
}

.output {
    grid-column: 1 / -1;
    background: transparent;
    display: flex;
    gap: 5px;
    align-items: flex-end;
    justify-content:space-evenly;
    flex-direction: column;
    word-wrap:break-word;
    word-break: break-all;
    font-family:'Franklin Gothic Medium', 'Arial Narrow', Arial, sans-serif;
    height: 7rem;
    padding: 20px 15px 10px 10px;
    width: 100%;
    border: none;
}

.output .previous-operand {
    color: rgba(75, 40, 0, 0.88);
    font-size: 1.5rem;
}

.output .current-operand {
    color: rgb(75, 40, 0);
    font-size: 2.5rem;
}

button {
    height: 70px;
    border-radius: 20px;
    border: 2px solid rgb(161, 133, 8);
    background-color: transparent;
    font-size: 3rem;
    color: rgb(143, 98, 0);
}

button:hover {
    background-color: rgba(189, 140, 7, 0.3);
    font-weight:900;
    cursor: pointer;

}
button:active {
    background-color: rgba(150, 102, 0, 0.9);
    color: rgba(255, 255, 255, 0.9);
}

.clear-all {
    font-size: 37px;
}
.clear-all:active {
    background-color: rgb(199, 64, 64);
}

.delete {
    font-size: 37px;    
}
.delete:active {
    background-color: rgb(187, 36, 10);
}

.equal-sign {
    height: 100%;
    grid-area: 2 / 4/ 5 /5; 
}

.equal-sign:active {
    background-color: rgba(0, 87, 0, 0.5);
}

.keys {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
    padding: 0 20px 0 20px;
}


@media screen and (max-width: 768px) {
    html {
        font-size: 0.95rem;
    }
    .container {
        width: 50vw;
        height: 70vh;
    }
}

@media only screen and (max-width: 670px) {
    html {
        font-size: 0.95rem;
    }
    .container {
        width: 68vw;
        height: 70vh;
    }
}

@media only screen and (min-width: 670px) {
    html {
        font-size: 0.95rem;
    }
    .container {
        width: 50vw;
        height: 70vh;
    }

}

@media only screen and (min-width: 970px) {
    html {
        font-size: 0.95rem;
    }
    .container {
        width: 35vw;
        height: 70vh;
    }

}