body {
    background: linear-gradient(90deg, #b1d7ed, #a4cadf );
    display: flex;
    justify-content: center;
    align-items: center;
}
#container {
    width: 900px;
    margin: 20px;
    box-sizing: border-box;
    font-family: "Courier New", monospace;
}
#screen {
    height: 200px;
    border: 4px solid #2b2b2b;
    margin: 0;
    background: linear-gradient(180deg, #dff7d6, #bfe8b0);
    font-size: 50px;
    font-weight: bold;
    text-align: right;
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    font-family: "Courier New", monospace;
    color: #1f3b1f;
    box-shadow:
    inset 0 0 10px rgba(0, 0, 0, 0.2),
    0 4px 0 #1a1a1a;
    letter-spacing: 2px;
    overflow: hidden;
    white-space: nowrap;
}

#device-body {
    display: flex;
    gap: 20px;
    background: linear-gradient(180deg, #9b9494, #7f7777); 
    justify-content: center;
    padding: 25px 15px;
    border: 4px solid #3d3d3d;
    border-radius: 10px;
    box-shadow: inset 0 0 15px rgba(0, 0, 0, 0.3);
}
.wrapper {
    display: flex;
    flex-wrap: wrap;
    width: 420px;
    gap: 15px;
}

.wrapper button {
    width: 120px;
    height: 120px;

    font-size: 28px;
    font-weight: bold;
    background: linear-gradient(180deg, #f2f2f2, #cfcfcf);

    border: 3px solid #333;
    border-radius: 8px;
    box-shadow: 0 4px 0 #222;
    cursor: pointer;
}
.wrapper button:active {
    transform: translateY(3px);
    box-shadow: 0 1px 0 #222;
}
.operators {
    display: flex;
    flex-direction: column;
    gap: 15px;
}
.operators button {
    width: 120px;
    height: 120px;

    font-size: 28px;
    font-weight: bold;

    background: linear-gradient(180deg, #ffd27a, #e6a800);
    border: 3px solid #333;
    border-radius: 8px;
    box-shadow: 0 4px 0 #222;
    cursor: pointer;
}
.operators button:active {
    transform: translateY(3px);
    box-shadow: 0 1px 0 #222;
}
.enter-delete {
    display: flex;
    flex-direction: column;
    gap: 15px;
}
.enter-delete button {
    width: 120px;
    height: 250px;
    font-size: 28px;
    font-weight: bold;

    background: linear-gradient(135deg, #10b981 0%, #059669 100%);

    border: 3px solid #333;
    border-radius: 8px;
    box-shadow: 0 4px 0 #222;

    cursor: pointer;
    }
.enter-delete button:active {
    transform: translateY(3px);
    box-shadow: 0 1px 0 #222;
}