* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #121212;
    color: #f0f0f0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow: hidden;
}
.container {
    position: relative;
    width: 90vw;
    max-width: 800px;
    height: 70vh;
    max-height: 500px;
    border: 2px solid #444;
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    box-shadow: 0 0 25px rgba(0, 255, 255, 0.3);
    background-color: #181818;
    transition: background-color 0.1s ease-out, box-shadow 0.1s ease-out;
    z-index: 0;
}
textarea {
    flex-grow: 1;
    width: 100%;
    height: 100%;
    padding: 20px;
    font-size: 1.2em;
    background-color: transparent;
    color: #f0f0f0;
    border: none;
    outline: none;
    resize: none;
    font-family: monospace;
    line-height: 1.5;
    z-index: 2;
    caret-color: #00FFFF;
}
canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
    pointer-events: none;
}
textarea::placeholder {
    color: #b0b0b0;
    opacity: 1;
}
textarea::-webkit-input-placeholder {
    color: #b0b0b0;
    opacity: 1;
}
textarea::-moz-placeholder {
    color: #b0b0b0;
    opacity: 1;
}
textarea:-ms-input-placeholder {
    color: #b0b0b0;
    opacity: 1;
}
textarea::-ms-input-placeholder {
    color: #b0b0b0;
    opacity: 1;
}
textarea:focus {
    background-color: rgba(0, 0, 0, 0.1);
}