body {
    transition: background-color 0.4s, color 0.4s;
}

body.dark-mode {
    background-color: #0d0d0d;
}

.theme-switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 30px;
}

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    border-radius: 30px;
    cursor: pointer;
    transition: background-color 0.4s;
}

.slider i {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 24px;
    height: 24px;
    color: rgb(255, 255, 255);
    font-size: 18px;
    line-height: 24px;
    text-align: center;
    border-radius: 50%;
    transition: transform 0.4s, background-color 0.4s, color 0.4s;
}

input:checked+.slider {
    background-color: #666;
}

input:checked+.slider i {
    transform: translateX(30px);
    color: white;
}