package net.ccbluex.liquidbounce.injection.forge.mixins.gui;

import net.ccbluex.liquidbounce.ui.font.AWTFontRenderer;
import net.ccbluex.liquidbounce.ui.font.Fonts;
import net.ccbluex.liquidbounce.utils.render.RenderUtils;
import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.FontRenderer;
import net.minecraft.client.gui.Gui;
import net.minecraft.client.gui.GuiButton;
import net.minecraft.client.renderer.GlStateManager;
import net.minecraft.util.ResourceLocation;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;
import org.spongepowered.asm.mixin.Final;
import org.spongepowered.asm.mixin.Mixin;
import org.spongepowered.asm.mixin.Overwrite;
import org.spongepowered.asm.mixin.Shadow;

import java.awt.*;


@Mixin(GuiButton.class)
@SideOnly(Side.CLIENT)
public abstract class MixinGuiButton extends Gui {

   @Shadow
   public boolean visible;

   @Shadow
   public int xPosition;

   @Shadow
   public int yPosition;

   @Shadow
   public int width;

   @Shadow
   public int height;

   @Shadow
   protected boolean hovered;

   @Shadow
   public boolean enabled;

   @Shadow
   protected abstract void mouseDragged(Minecraft mc, int mouseX, int mouseY);

   @Shadow
   public String displayString;

   @Shadow
   @Final
   protected static ResourceLocation buttonTextures;
   private float cut;
   private float alpha;

   @Overwrite
   public void drawButton(Minecraft mc, int mouseX, int mouseY) {
      if (visible) {
         final FontRenderer fontRenderer =
            mc.getLanguageManager().isCurrentLocaleUnicode() ? mc.fontRendererObj : Fonts.font35;
         hovered = (mouseX >= this.xPosition && mouseY >= this.yPosition &&
                    mouseX < this.xPosition + this.width && mouseY < this.yPosition + this.height);

         final int delta = RenderUtils.deltaTime;

         if (enabled && hovered) {
            cut += 0.05F * delta;

            if (cut >= 4) cut = 4;

            alpha += 0.3F * delta;

            if (alpha >= 210) alpha = 210;
         } else {
            cut -= 0.05F * delta;

            if (cut <= 0) cut = 0;

            alpha -= 0.3F * delta;

            if (alpha <= 120) alpha = 120;
         }

         Gui.drawRect(this.xPosition + (int) this.cut, this.yPosition,
                 this.xPosition + this.width - (int) this.cut, this.yPosition + this.height,
                 this.enabled ? new Color(1F, 0.8F, 1F, this.alpha / 255F).getRGB() :
                         new Color(1F, 0.7F, 1F, 1F).getRGB());
         RenderUtils.drawBorderedRect(this.xPosition + (int) this.cut, this.yPosition,
                 this.xPosition + this.width - (int) this.cut, this.yPosition + this.height,3F, new Color(255,200,255,255).getRGB(), new Color(255, 190, 255, 50).getRGB());
         RenderUtils.drawBorderedRect(this.xPosition + (int) this.cut, this.yPosition,
                 this.xPosition + this.width - (int) this.cut, this.yPosition + this.height,1F, new Color(30,30,30,180).getRGB(), new Color(255, 180, 255, 0).getRGB());

         mc.getTextureManager().bindTexture(buttonTextures);
         mouseDragged(mc, mouseX, mouseY);

         AWTFontRenderer.Companion.setAssumeNonVolatile(true);

         fontRenderer.drawStringWithShadow(displayString,
                 (float) ((this.xPosition + this.width / 2) -
                         fontRenderer.getStringWidth(displayString) / 2),
                 this.yPosition + (this.height - 5) / 2F, 14737632);

         AWTFontRenderer.Companion.setAssumeNonVolatile(false);

         GlStateManager.resetColor();
      }
   }
}

and MixinButtonExt

package net.ccbluex.liquidbounce.injection.forge.mixins.gui;

import net.ccbluex.liquidbounce.ui.font.Fonts;
import net.ccbluex.liquidbounce.utils.render.RenderUtils;
import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.FontRenderer;
import net.minecraft.client.gui.GuiButton;
import net.minecraft.client.renderer.GlStateManager;
import net.minecraftforge.fml.client.config.GuiButtonExt;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;
import org.spongepowered.asm.mixin.Mixin;
import org.spongepowered.asm.mixin.Overwrite;

import java.awt.*;

@Mixin(GuiButtonExt.class)
@SideOnly(Side.CLIENT)
public abstract class MixinGuiButtonExt extends GuiButton {
   private float cut;
   private float alpha;

   public MixinGuiButtonExt(int p_i1020_1_, int p_i1020_2_, int p_i1020_3_, String p_i1020_4_) {
      super(p_i1020_1_, p_i1020_2_, p_i1020_3_, p_i1020_4_);
   }

   public MixinGuiButtonExt(int p_i46323_1_, int p_i46323_2_, int p_i46323_3_, int p_i46323_4_,
                            int p_i46323_5_, String p_i46323_6_) {
      super(p_i46323_1_, p_i46323_2_, p_i46323_3_, p_i46323_4_, p_i46323_5_, p_i46323_6_);
   }

   @Overwrite
   public void drawButton(Minecraft mc, int mouseX, int mouseY) {
      if (visible) {
         final FontRenderer fontRenderer =
            mc.getLanguageManager().isCurrentLocaleUnicode() ? mc.fontRendererObj : Fonts.font35;
         hovered = (mouseX >= this.xPosition && mouseY >= this.yPosition &&
                    mouseX < this.xPosition + this.width && mouseY < this.yPosition + this.height);

         final int delta = RenderUtils.deltaTime;

         if (enabled && hovered) {
            cut += 0.05F * delta;

            if (cut >= 4) cut = 4;

            alpha += 0.3F * delta;

            if (alpha >= 210) alpha = 210;
         } else {
            cut -= 0.05F * delta;

            if (cut <= 0) cut = 0;

            alpha -= 0.3F * delta;

            if (alpha <= 120) alpha = 120;
         }
         RenderUtils.drawCircleRect(this.xPosition + (int) this.cut, this.yPosition,
                      this.xPosition + this.width - (int) this.cut, this.yPosition + this.height,
                      2f,this.enabled ? new Color(0F, 0F, 0F, this.alpha / 255F).getRGB() :
                      new Color(0.5F, 0.5F, 0.5F, 0.5F).getRGB(),true);

         mc.getTextureManager().bindTexture(buttonTextures);
         mouseDragged(mc, mouseX, mouseY);

         fontRenderer.drawStringWithShadow(displayString,
                                           (float) ((this.xPosition + this.width / 2) -
                                                    fontRenderer.getStringWidth(displayString) / 2),
                                           this.yPosition + (this.height - 5) / 2F, 14737632);
         GlStateManager.resetColor();
      }
   }
}

just copy it and replace️️