https://github.com/FoxRefire/Librezam/issues/1 userContent.css

userContent.css

/*--------------------------------------------------------------
- Librezam Firefox Extension - Popup Styling
- https://github.com/FoxRefire/Librezam/
- CSS mockup by soulhotel
- INDEX BELOW (ctrl+f search for a section):

header element positioning
seperator style
history table
result table
streaming providers
settings layout
-------------------------------------------------------------*/

:root {
    --brand-color: rgb(26,112,216);
}


body {
    width: 350px;
    height: 500px;
    overflow-y: auto;
    background-image: url("https://i.imgur.com/z337Q68.png");
}


/* header element positioning -------------------------------*/

/* header container */
#surfaceContainer {
    height:56px;
    align-items: center;
    justify-content: center;
}
/* setting button */
#settingsButton {
    font-size: 45px !important;
    color:var(--brand-color);
    margin:10px 9px;
    &:hover {
    transform:scale(1.1);
    }
}
/* preloader animation */
.preloader-wrapper.big {
    width: 36px !important;
    height: 36px !important;
    margin:14px 14px;
}
.preloader-wrapper {
    display:flex; /*display correction*/
    float:left;
}


/* seperator style (hr) -------------------------------------*/

hr {
    width:96%;
    border-radius:96%;
    color: color-mix(in srgb, var(--md-sys-color-outline-variant) 90%, transparent 10%)
}


/* history table --------------------------------------------*/

/* spacing */
#historyTable * {
    padding-inline:12px;
}
/* border adjust */
#historyTable tr {
    border-bottom: 1px solid color-mix(in srgb, var(--md-sys-color-outline-variant) 30%, transparent 70%);
}
/* title clarity */
#historyTable th {
    text-decoration: underline;
}


/* result table ---------------------------------------------*/

/* spacing */
#resultTable * {
    padding-inline:12px;
}
/* border adjust */
#resultTable tr {
    border-bottom: 1px solid color-mix(in srgb, var(--md-sys-color-outline-variant) 5%, transparent 75%);
}
/* title clarity */
#resultTable td:not([id*="artistResult"], [id*="yearResult"], [id*="titleResult"]) {
    font-weight: bold;
}
/* adjust spacing when #resultTable.active */
#surfaceContainer:has(#resultTable:not([style="display:none; text-align: center;"])) {
    margin-bottom:170px !important;
/*
56+56 for header specified header height above,
114 for qol spacing between #streamProviders and #historyTable
*/
}


/* streaming providers --------------------------------------*/

#streamProviders a {
    font-size:32px;
    margin-inline:10px;
    padding:12px 8px 6px 8px;
    border: 1px solid color-mix(in srgb,var(--md-sys-color-outline-variant) 50%, transparent 50%);
    border-radius:5px;
    background-color:rgba(15,100,150,0.0);
    backdrop-filter: blur(50px);
    &:hover {
       border-width:2px;
    }
}


/* settings layout ------------------------------------------*/

/* header styling */
nav, .nav-wrapper {
    background-color:rgba(0,0,0,0.05) !important;
}
nav .brand-logo, nav .back_button {
    color: var(--brand-color) !important;
}
nav .back_button {
    margin-left:10px !important;
    padding-inline:5px !important;
    width:52px !important;
    &:hover {
        transform:scale(1.2) !important;
    }
}
/* recording length input field */
.input-field #recordLength, .input-field input {
    margin-inline: 3% !important;
}
.input-field #recordLength {
    font-size:32px !important;
    margin-inline:3% !important;
    width: 94% !important;
    padding:12px 12px !important;
    border: 1px solid color-mix(in srgb,var(--md-sys-color-outline-variant) 50%, transparent 50%) !important;
    border-radius:5px !important;
    background-color:rgba(15,100,150,0.0) !important;
    backdrop-filter: blur(25px) !important;
    &:hover {
        border-width:2px !important;
    }

}
/* clear history button */
body a[class="btn filled icon-left modal-trigger"] {
    margin: 12px 3% !important;
    border: 1px solid color-mix(in srgb,var(--md-sys-color-outline-variant) 50%, transparent 50%) !important;
    border-radius:5px !important;
    &:hover {
        border-width:2px !important;
        color: var(--brand-color) !important;
    }
}