src/css/common/base.css
.sidr {
    /* Default Settings */
    display: block;
    position: fixed;
    top: 0;
    height: 100%;
    z-index: 999999;
    width: var(--sidrSidebarWidth);
    overflow-x: hidden;
    overflow-y: auto;

    & .sidr-inner {
        padding: 0 0 15px;

        & > p {
            margin-left: 15px;
            margin-right: 15px;
        }
    }

    &.sidr-right {
        left: auto;
        right: -var(--sidrSidebarWidth);
    }

    &.sidr-left {
        left: -var(--sidrSidebarWidth);
        right: auto;
    }

    /* Theme Settings */
    font-family: var(--sidrFontFamily);
    font-size: var(--sidrFontSize);
    background: var(--sidrBackground);
    color: var(--sidrTextColor);
    box-shadow: 0 0 5px 5px var(--sidrBackgroundShadowColor) inset;

    & h1,
    & h2,
    & h3,
    & h4,
    & h5,
    & h6 {
        font-size: var(--sidrFontSize) - 4;
        font-weight: normal;
        padding: 0 15px;
        margin: 0 0 5px;
        color: var(--sidrTextColor);
        line-height: 24px;
        box-shadow: 0 5px 5px 3px rgba(var(--sidrBoxShadowColor), .2);
    }

    & p {
        font-size: var(--sidrFontSize) - 2;
        margin: 0 0 12px;

        & a {
            color: rgba(var(--sidrTextColor), .9);
        }
    }

    & > p {
        margin-left: 15px;
        margin-right: 15px;
    }

    & ul {
        display: block;
        margin: 0 0 15px;
        padding: 0;
        border-top: 1px solid darken(var(--sidrBackground), 10%);
        border-bottom: 1px solid lighten(var(--sidrBackground), 10%);

        & li {
            display: block;
            margin: 0;
            line-height: 48px;
            border-top: 1px solid lighten(var(--sidrBackground), 10%);
            border-bottom: 1px solid darken(var(--sidrBackground), 10%);

            &:hover,
            &.active,
            &.sidr-class-active {
                border-top: 0;
                line-height: 49px;

                & > a,
                & > span {
                    box-shadow: 0 0 15px 3px var(--sidrBackgroundShadowColor) inset;
                }
            }

            & a,
            & span {
                padding: 0 15px;
                display: block;
                text-decoration: none;
                color: var(--sidrTextColor);
            }

            & ul {
                border-bottom: 0;
                margin: 0;

                & li {
                    line-height: 40px;
                    font-size: var(--sidrFontSize) - 2;

                    &:last-child {
                        border-bottom: 0;
                    }

                    &:hover,
                    &.active,
                    &.sidr-class-active {
                        border-top: 0;
                        line-height: 41px;

                        & > a,
                        & > span {
                            box-shadow: 0 0 15px 3px var(--sidrBackgroundShadowColor) inset;
                        }
                    }

                    & a,
                    & span {
                        color: rgba(var(--sidrTextColor), .8);
                        padding-left: 30px;
                    }
                }
            }
        }
    }

    & form {
        margin: 0 15px;
    }

    & label {
        font-size: var(--sidrFontSize) - 2;
    }

    & input[type="text"],
    & input[type="password"],
    & input[type="date"],
    & input[type="datetime"],
    & input[type="email"],
    & input[type="number"],
    & input[type="search"],
    & input[type="tel"],
    & input[type="time"],
    & input[type="url"],
    & textarea,
    & select {
        width: 100%;
        font-size: var(--sidrFontSize) - 2;
        padding: 5px;
        box-sizing: border-box;
        margin: 0 0 10px;
        border-radius: 2px;
        border: 0;
        background: rgba(var(--sidrInputBackgroundColor), .1);
        color: rgba(var(--sidrTextColor), .6);
        display: block;
        clear: both;
    }

    & input[type=checkbox] {
        width: auto;
        display: inline;
        clear: none;
    }

    & input[type=button],
    & input[type=submit] {
        color: var(--sidrBackground);
        background: var(--sidrTextColor);

        &:hover {
            background: rgba(var(--sidrTextColor), .9);
        }
    }
}
