My Waybar config

config

{
    "layer": "top", // Waybar at top layer
    "modules-left": ["sway/workspaces"],
    "modules-right": ["tray", "cpu", "memory", "backlight", "network", "pulseaudio", "battery", "clock"],
    "tray": {
        // "icon-size": 21,
        "spacing": 10
    },
    "clock": {
        "tooltip-format": "{:%Y-%m-%d | %H:%M}",
        "format-alt": "{:%Y-%m-%d}",
        "format": "{:%a %Y-%m-%d %l:%M %p}"
    },
    "cpu": {
        "format": "　{usage}%"
    },
    "memory": {
        "format": "　{}%"
    },
    "backlight": {
        //"device": "intel_backlight",
        "format": "　{percent}%",
        "format-icons": ["", ""]
    },
    "battery": {
        //"states": {
        //    // "good": 95,
        //    "warning": 30,
        //    "critical": 15
        //},
        "format": "　{capacity}%"
        // "format-good": "", // An empty format will hide the module
        // "format-full": "",
        //"format-icons": ["", "", "", "", ""]
    },
    "network": {
        // "interface": "wlp2s0", // (Optional) To force the use of this interface
        "format-wifi": "　{signalStrength}%",
        "format-ethernet": "{ifname}: {ipaddr}/{cidr} ethernet",
        "format-disconnected": "⚠"
    },
    "pulseaudio": {
        //"scroll-step": 1,
        "format": "　{volume}%",
        "format-bluetooth": "{volume}% {icon}",
        "format-muted": "",
        "format-icons": {
            "headphones": "",
            "handsfree": "",
            "headset": "",
            "phone": "",
            "portable": "",
            "car": "",
            "default": ["", ""]
        },
        "on-click": "pavucontrol"
    }
}

style.css

* {
    border: none;
    border-radius: 0;
    /*font-family: "Hack", "Noto Color Emoji", sans-serif;*/
    font-size: 18px;
    /*font-weight: bold;*/
    min-height: 0;
}

window#waybar {
    background: #000000;
    /*border-bottom: 3px solid rgba(100, 114, 125, 0.5);*/
    color: #e5e9f0;
}

/* https://github.com/Alexays/Waybar/wiki/FAQ#the-workspace-buttons-have-a-strange-hover-effect */
#workspaces button {
    padding: 0 5px;
    background: transparent;
    color: #ffffff;
    border-bottom: 3px solid transparent;
}

#workspaces button.focused {
    background: #4c566a;
    border-bottom: 3px solid #e5e9f0;
}

#workspaces button.urgent {
    background-color: #bf616a;
}

#mode {
    background: #64727D;
    border-bottom: 3px solid #ffffff;
}

#clock, #battery, #cpu, #memory, #temperature, #backlight, #network, #pulseaudio, #custom-media, #tray, #mode, #idle_inhibitor {
    padding: 0 10px;
    margin: 0 5px;
}

#clock {
    /*background-color: #64727D;*/
    color: #e5e9f0;
    font-weight: bold;
}

#battery {
    /*background-color: #000000;*/
    color: #e5e9f0;
}

#battery.charging {
    /*background-color: #000000;*/
    color: #e5e9f0;
}

@keyframes blink {
    to {
        /*background-color: #ffffff;*/
        color: #000000;
    }
}

#battery.critical:not(.charging) {
    background: #f53c3c;
    color: #ffffff;
    animation-name: blink;
    animation-duration: 0.5s;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
    animation-direction: alternate;
}

#cpu {
    /*background: #2ecc71;*/
    color: #e5e9f0;
}

#memory {
    /*background: #9b59b6;*/
    color: #e5e9f0;
}

#backlight {
    /*background: #90b1b1;*/
    color: #e5e9f0;
}

#network {
    /*background: #2980b9;*/
    color: #e5e9f0;
}

#network.disconnected {
    /*background: #f53c3c;*/
    color: #e5e9f0;
}

#pulseaudio {
    /*background: #000000;*/
    color: #e5e9f0;
}

#pulseaudio.muted {
    /*background: #000000;*/
    color: #e5e9f0;
}

#custom-media {
    background: #66cc99;
    color: #2a5c45;
}

.custom-spotify {
    background: #66cc99;
}

.custom-vlc {
    background: #ffa000;
}

#temperature {
    background: #f0932b;
}

#temperature.critical {
    background: #eb4d4b;
}

#tray {
    /*background-color: #2980b9;*/
    color: #e5e9f0;
}

#idle_inhibitor {
    background-color: #2d3436;
}

#idle_inhibitor.activated {
    background-color: #ecf0f1;
    color: #2d3436;
}