*{
    box-sizing: border-box;
}
body{
    font-family: 'Roboto', sans-serif;
    background-color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    text-align: center;
    min-height: 100vh;
    margin: 0;
    transition: background 0.2s linear;
}
body.dark{
    background-color: #1f1f1f;
}
body.dark h1, body.dark .support a {
    color: white;
}
.checkbox{
    opacity: 0;
    position: absolute;
}
.checkbox-label{
    background-color: #111;
    width: 50px;
    height: 26px;
    border-radius: 50px;
    position: relative;
    padding: 5px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.fa-moon{
    color: #f1c40f;
}
.fa-sun{
    color: #f39c12;
}
.checkbox-label .ball{
    background-color: white;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    position: absolute;
    top: 2px; 
    left: 2px;
    transition: transform 0.2s linear;
}
.checkbox:checked + .checkbox-label .ball{
    transform: translateX(24px);
}