Apex Chart - Change X-Axis Font Size

Configuration Frontend
,
1

I am unable to change the font size on my x-axis.

When I try to add xaxis: to the configuration it says:

apexcharts-card version 2.2.3 /// value.xaxis is extraneous

I was able to change the yaxis font size. Below is my currently working config:

type: custom:apexcharts-card
section_mode: true
grid_options:
  rows: 8
  columns: full
graph_span: 24h
header:
  show: true
  title: Cold Water Booster Pumps Suction and System Pressures
yaxis:
  - min: 0
    max: 150
    decimals: 0
    apex_config:
      tickAmount: 11
      title:
        text: Pressure (psig)
        style:
          fontSize: 20px
      labels:
        style:
          fontSize: 20px
series:
  - entity: sensor.cw_pumps_suc_press_lts
    type: line
    stroke_width: 1
    name: Suction Pressure
    group_by:
      func: avg
      duration: 15s
  - entity: sensor.cw_pumps_sys_press_lts
    type: line
    stroke_width: 1
    name: System Pressure
    group_by:
      func: avg
      duration: 15s