* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    font-family: "Roboto Mono", monospace;
}
body {
    background-color: #e7f3f5;
    display: flex;
    flex-direction: column;
    gap: 20px;
    justify-content: center;
    align-items: center;
    height: 100vh;
}
body > h1 {
    color: #ffff;
}
.calculator {
    background-color: #2e2e3a;
    width: 350px;
    padding: 20px;
    border-radius: 20px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}
.display input[type="text"] {
    width: 100%;
    padding: 15px;
    text-align: right;
    font-size: 24px;
    border: none;
    background-color: #333;
    color: #fff;
    border-radius: 10px;
    margin-bottom: 15px;
}
.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}
.buttons input[type="button"] {
    padding: 15px;
    font-size: 18px;
    border: none;
    border-radius: 10px;
    background-color: #444;
    color: #fff;
    cursor: pointer;
    transition: background-color 0.3s ease;
}
.buttons input[type="button"]:hover {
    background-color: #666;
}
.buttons input#clear,
.buttons input#erase {
    background-color: #f05454;
    color: #fff;
}
.buttons input#equal {
    background-color: #0078ff;
    color: #fff;
}
.buttons input#equal:hover,
.buttons input#clear:hover,
.buttons input#erase:hover {
    background-color: #0056cc;
}
.buttons input#pow,
.buttons input#sin,
.buttons input#cos,
.buttons input#tan,
.buttons input#pi,
.buttons input#e,
.buttons input#log2 {
    background-color: #1f4068;
    color: #fff;
}
.buttons input#pow:hover,
.buttons input#sin:hover,
.buttons input#cos:hover,
.buttons input#tan:hover,
.buttons input#pi:hover,
.buttons input#e:hover,
.buttons input#log:hover {
    background-color: #394867;
}