styles.css

body {
    padding: 100px;
    font-family: Roboto, -apple-system, BlinkMacSystemFont, 'Segoe UI', Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

.forcedark {
    background: #000;
    color: #FFF;

}

.forcedark #darkmodebutton {
    display: none;
}

.forcedark #lightmodebutton {
    display: inline-block;
}

.forcelight {
    background: #FFF;
    color: #000;
}

.forcelight #lightmodebutton {
    display: none;
}

.forcelight #darkmodebutton {
    display: inline-block;
}

.button-29 {
    align-items: center;
    appearance: none;
    background-image: radial-gradient(100% 100% at 100% 0, #5adaff 0, #5468ff 100%);
    border: 0;
    border-radius: 6px;
    box-shadow: rgba(45, 35, 66, .4) 0 2px 4px, rgba(45, 35, 66, .3) 0 7px 13px -3px, rgba(58, 65, 111, .5) 0 -3px 0 inset;
    box-sizing: border-box;
    color: #fff;
    cursor: pointer;
    display: inline-flex;
    font-family: "JetBrains Mono", monospace;
    height: 48px;
    justify-content: center;
    line-height: 1;
    list-style: none;
    overflow: hidden;
    padding-left: 16px;
    padding-right: 16px;
    position: relative;
    text-align: left;
    text-decoration: none;
    transition: box-shadow .15s, transform .15s;
    user-select: none;
    -webkit-user-select: none;
    touch-action: manipulation;
    white-space: nowrap;
    will-change: box-shadow, transform;
    font-size: 18px;
}

.button-29:focus {
    box-shadow: #3c4fe0 0 0 0 1.5px inset, rgba(45, 35, 66, .4) 0 2px 4px, rgba(45, 35, 66, .3) 0 7px 13px -3px, #3c4fe0 0 -3px 0 inset;
}

.button-29:hover {
    box-shadow: rgba(45, 35, 66, .4) 0 4px 8px, rgba(45, 35, 66, .3) 0 7px 13px -3px, #3c4fe0 0 -3px 0 inset;
    transform: translateY(-2px);
}

.button-29:active {
    box-shadow: #3c4fe0 0 3px 7px inset;
    transform: translateY(2px);
}

@media screen and (max-width: 900px) {
    body {
        padding: 40px;
    }
    #lightmodebutton, #darkmodebutton {
        margin-bottom: 10px;   
    }
}

@media (prefers-color-scheme: light) {
    body {
        background: #FFF;
        color: #000;
    }

    #lightmodebutton {
        display: none;
    }

}

@media (prefers-color-scheme: dark) {
    body {
        background: #000;
        color: #FFF;
    }

    #darkmodebutton {
        display: none;
    }

}

a:link {
    color: hsl(207, 100%, 45%);
    text-decoration: none;
}

a:visited {
    color: hsl(207, 100%, 45%);
    text-decoration: none;
}

a:hover {
    border-bottom: 2px solid;
}

a:active {
    color: hsl(207, 100%, 45%);
    border: 2px solid;
    padding-right: 3px;
    padding-left: 3px;
}