body {
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
    margin: 0;
    padding: 0;
}

.menu-hamburguesa {
    position: relative;
    display: inline-block;
}

.menu-icon {
    font-size: 2em;
    cursor: pointer;
    display: inline-block;
}

.menu {
    display: none;
    position: absolute;
    top: 50px;
    left: 0;
    width: 200px;
    background-color: #333;
    color: #fff;
    padding: 10px;
    border-radius: 5px;
    z-index: 1000;
}

.menu a {
    color: #fff;
    text-decoration: none;
    display: block;
    padding: 10px;
}

.menu a:hover {
    background-color: #444;
}

#menu-toggle {
    display: none;
}

#menu-toggle:checked + .menu-icon + .menu {
    display: block;
}

main {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.calculator {
    background-color: #444;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

#displayBox {
    width: 100%;
    height: 60px;
    text-align: right;
    background-color: #fff;
    border: none;
    border-radius: 5px;
    font-size: 2em;
    padding: 10px;
    margin-bottom: 20px;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
}

.button-container {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
}

.button {
    width: 100%;
    height: 60px;
    font-size: 1.2em;
    border: none;
    border-radius: 5px;
    color: #fff;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    cursor: pointer;
}

.button:hover {
    opacity: 0.9;
}

.greybutton {
    background-color: #808080;
}

.blackbutton {
    background-color: #000;
}

.greenbutton {
    background-color: #4CAF50;
}

.bluebutton {
    background-color: #2196F3;
}

.redbutton {
    background-color: #f44336;
}