body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

.black-bar {
    background-color: black;
    padding: 10px 0;
    text-align: center;
    position: relative;
}

.title {
    color: white;
    margin: 0;
}

.moving-ball {
    width: 20px;
    height: 20px;
    background: linear-gradient(to right, violet, indigo, blue, green, yellow, orange, red); /* Rainbow gradient */
    border-radius: 50%;
    position: absolute;
    top: calc(50% - 10px); /* Adjust vertically centered */
    left: calc(100% - 40px); /* Position at the edge of black bar */
    animation: moveBall 4s linear forwards;
}

@keyframes moveBall {
    0% {
        left: calc(100% - 40px); /* Initial position */
    }
    50% {
        left: calc(100% - 40px); /* Move to the end of the black bar */
    }
    51% {
        left: calc(100% - 40px); /* Hold the position until the end of animation */
    }
    100% {
        left: calc(100% - 40px); /* Hold the position until the end of animation */
    }
}

.container {
    max-width: 90%; /* Responsive max-width */
    margin: 0 auto;
    text-align: center;
    padding-top: 20px;
}

.button-group {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 10px;
}

.button-group > * {
    margin: 5px;
}

textarea {
    width: 90%; /* Responsive width */
    height: 200px;
    margin-bottom: 20px;
    padding: 10px;
    box-sizing: border-box; /* Include padding in width */
}

button, select {
    padding: 10px 20px;
    cursor: pointer;
}

.usage {
    margin-top: 20px;
    text-align: left; /* Align usage instructions to left */
}

.usage ol {
    margin-left: 20px; /* Adjust left margin */
}

.centered {
    text-align: center;
}