body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f7f7f7;
}

.container {
    max-width: 800px;
    margin: 40px auto;
    text-align: center;
    padding: 20px;
    background-color: #fff;
    border: 1px solid #ddd;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

header {
    background-color: #333;
    color: #fff;
    padding: 20px;
    text-align: center;
}

header h1 {
    font-size: 24px;
    margin-bottom: 10px;
}

main {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.loader {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 3px solid #333;
    border-top-color: #fff;
    animation: spin 2s linear infinite;
}

.loader-inner {
    position: relative;
}

.loader-line-wrap {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.loader-line {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #333;
    animation: line-move 2s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

@keyframes line-move {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(100%);
    }
}

footer {
    background-color: #333;
    color: #fff;
    padding: 10px;
    text-align: center;
    clear: both;
}