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* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: Arial, sans-serif;
    background-color: #1c1c1e;
    color: #f0f0f5;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
}
.container {
    text-align: center;
}
h1 {
    margin-bottom: 1em;
    font-size: 24px;
    color: #f0f0f5;
}
.toggle {
    position: relative;
    display: inline-block;
    width: 80px;
    height: 40px;
    cursor: pointer;
}
.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}
.slider {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #333;
    border-radius: 90px;
    transition: background-color 0.4s;
    z-index: 2;
}
.slider:before {
    position: absolute;
    content: "";
    height: 30px;
    width: 30px;
    left: 5px;
    bottom: 5px;
    background-color: white;
    transition: transform 0.4s;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}
.border-line {
    position: absolute;
    top: -4px;
    left: -4px;
    right: -4px;
    bottom: -4px;
    border-radius: 90px;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.9s;
    overflow: hidden;
}
.border-line::before {
    content: "";
    position: absolute;
    height: 8px;
    width: 30px;
    background-color: #928f91;
    border-radius: 4px;
    box-shadow: 0 0 8px rgba(27, 27, 27, 0.8);
    animation: moveDotSmooth 3s infinite linear;
}
@keyframes moveDotSmooth {
    0% { top: 0; left: 0; }
    25% { top: 0; left: calc(100% - 30px); }
    50% { top: calc(100% - 8px); left: calc(100% - 30px); }
    75% { top: calc(100% - 8px); left: 0; }
    100% { top: 0; left: 0; }
}
input:checked + .slider {
    background-color: #1f201f;
}
input:checked + .slider:before {
    transform: translateX(40px);
}
input:checked ~ .border-line {
    opacity: 1;
}

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