My Rider C# color scheme based on the "Rider Light" color scheme. It has a nice lightgrey background that's easy on the eyes.

RiderLightGrey.icls

<scheme name="Rider Light Custom" version="142" parent_scheme="Rider Light">
  <option name="FONT_SCALE" value="1.0" />
  <metaInfo>
    <property name="created">2020-05-07T00:51:07</property>
    <property name="ide">Rider</property>
    <property name="ideVersion">2020.1.1.0.0</property>
    <property name="modified">2020-05-07T00:51:30</property>
    <property name="originalScheme">Rider Light Custom</property>
  </metaInfo>
  <option name="LINE_SPACING" value="1.2" />
  <option name="EDITOR_FONT_SIZE" value="13" />
  <option name="EDITOR_FONT_NAME" value="Consolas" />
  <colors>
    <option name="CARET_ROW_COLOR" value="efefef" />
    <option name="GUTTER_BACKGROUND" value="e8e8e8" />
  </colors>
  <attributes>
    <option name="IDENTIFIER_UNDER_CARET_ATTRIBUTES">
      <value>
        <option name="BACKGROUND" value="dbe0cc" />
        <option name="ERROR_STRIPE_COLOR" value="c3d5f9" />
      </value>
    </option>
    <option name="MATCHED_BRACE_ATTRIBUTES">
      <value>
        <option name="FOREGROUND" value="0" />
        <option name="BACKGROUND" value="e8c8ee" />
      </value>
    </option>
    <option name="ReSharper.CSHARP_ACCESSOR_IDENTIFIER">
      <value>
        <option name="FOREGROUND" value="9670" />
      </value>
    </option>
    <option name="ReSharper.CSHARP_BLOCK_COMMENT">
      <value>
        <option name="FOREGROUND" value="528d31" />
        <option name="FONT_TYPE" value="2" />
      </value>
    </option>
    <option name="ReSharper.CSHARP_CONSTANT_IDENTIFIER">
      <value>
        <option name="FOREGROUND" value="688c" />
        <option name="FONT_TYPE" value="1" />
      </value>
    </option>
    <option name="ReSharper.CSHARP_DOC_COMMENT">
      <value>
        <option name="FOREGROUND" value="528d31" />
        <option name="FONT_TYPE" value="2" />
      </value>
    </option>
    <option name="ReSharper.CSHARP_ENUM_IDENTIFIER">
      <value>
        <option name="FOREGROUND" value="9d35ba" />
      </value>
    </option>
    <option name="ReSharper.CSHARP_EXTENSION_METHOD_IDENTIFIER">
      <value>
        <option name="FOREGROUND" value="996d" />
      </value>
    </option>
    <option name="ReSharper.CSHARP_FIELD_IDENTIFIER">
      <value>
        <option name="FOREGROUND" value="688c" />
      </value>
    </option>
    <option name="ReSharper.CSHARP_LATE_BOUND_IDENTIFIER">
      <value>
        <option name="FOREGROUND" value="688c" />
      </value>
    </option>
    <option name="ReSharper.CSHARP_LINE_COMMENT">
      <value>
        <option name="FOREGROUND" value="528d31" />
        <option name="FONT_TYPE" value="2" />
      </value>
    </option>
    <option name="ReSharper.CSHARP_LOCAL_FUNCTION_IDENTIFIER">
      <value>
        <option name="FOREGROUND" value="9670" />
      </value>
    </option>
    <option name="ReSharper.CSHARP_METHOD_IDENTIFIER">
      <value>
        <option name="FOREGROUND" value="9670" />
      </value>
    </option>
    <option name="ReSharper.CSHARP_MUTABLE_LOCAL_VARIABLE_IDENTIFIER">
      <value>
        <option name="FOREGROUND" value="383838" />
        <option name="EFFECT_TYPE" value="1" />
      </value>
    </option>
    <option name="ReSharper.CSHARP_NUMBER">
      <value>
        <option name="FOREGROUND" value="e13c31" />
      </value>
    </option>
    <option name="ReSharper.CSHARP_OVERLOADED_OPERATOR">
      <value>
        <option name="FOREGROUND" value="9670" />
      </value>
    </option>
    <option name="ReSharper.CSHARP_PARAMETER_IDENTIFIER">
      <value>
        <option name="FOREGROUND" value="383838" />
        <option name="EFFECT_COLOR" value="c3c3c3" />
        <option name="EFFECT_TYPE" value="1" />
      </value>
    </option>
    <option name="ReSharper.CSHARP_PROPERTY_IDENTIFIER">
      <value>
        <option name="FOREGROUND" value="688c" />
      </value>
    </option>
    <option name="ReSharper.CSHARP_STATIC_FIELD_IDENTIFIER">
      <value>
        <option name="FOREGROUND" value="688c" />
      </value>
    </option>
    <option name="ReSharper.CSHARP_STATIC_METHOD_IDENTIFIER">
      <value>
        <option name="FOREGROUND" value="9670" />
      </value>
    </option>
    <option name="ReSharper.CSHARP_STATIC_PROPERTY_IDENTIFIER">
      <value>
        <option name="FOREGROUND" value="688c" />
      </value>
    </option>
    <option name="ReSharper.CSHARP_STRING">
      <value>
        <option name="FOREGROUND" value="e26827" />
      </value>
    </option>
    <option name="ReSharper.CSHARP_STRUCT_IDENTIFIER">
      <value>
        <option name="FOREGROUND" value="9d35ba" />
      </value>
    </option>
    <option name="ReSharper.CSHARP_TUPLE_COMPONENT_NAME">
      <value>
        <option name="FOREGROUND" value="688c" />
      </value>
    </option>
    <option name="TEXT">
      <value>
        <option name="FOREGROUND" value="202020" />
        <option name="BACKGROUND" value="f0f0f0" />
      </value>
    </option>
    <option name="TODO_DEFAULT_ATTRIBUTES">
      <value>
        <option name="FOREGROUND" value="ab2c05" />
        <option name="FONT_TYPE" value="3" />
        <option name="ERROR_STRIPE_COLOR" value="88ab" />
      </value>
    </option>
    <option name="WRITE_IDENTIFIER_UNDER_CARET_ATTRIBUTES">
      <value>
        <option name="BACKGROUND" value="dbe0cc" />
        <option name="ERROR_STRIPE_COLOR" value="c3d5f9" />
      </value>
    </option>
  </attributes>
</scheme>