How to delete avatar/gravatar on author box

Hi, long time no see this support forum. I miss it actually, especially the awesome support from Tom and Mike.

Okay, so I have added the author box on my site with these code without installing any plugin. (these codes I take by other source).

And I have succesfully added the author box on my site, BUT I want the author box ONLY show my BIO, I dont confident to use my photo.

First, I add an Element on hook:

<div class="author-box">
	  <div class="avatar">
        <?php echo get_avatar( get_the_author_meta( 'ID' ) ); ?>
    </div>
    <div class="author-info">
		<h5 class="author-title" itemprop="author" itemscope itemtype="http://schema.org/Person">
			<span itemprop="name"><?php printf( get_the_author_meta( 'display_name') );?></span>
		</h5>
        <div class="author-summary">
            <p class="author-description"><?php echo wp_kses( get_the_author_meta( 'description' ), null ); ?></p></div>
					<div class="author-links">
            <a href="<?php echo get_author_posts_url( get_the_author_meta( 'ID' ) ); ?>" title="Read more">
                Read about me 
            </a>
        </div>
	</div>
</div>

And This is the CSS style:

.author-box {
	padding: 3%;
	padding-bottom: 25px;
	margin-top: 60px;
	font-size: 0.9em;
	background-color: #ecf2f8;
	display: -webkit-box;
	display: -ms-flexbox;
	display: flex;
	-webkit-box-align: center;
	-ms-flex-align: center;
	align-items: center;
	border: 1px solid #1d73be;	
}
.author-box .avatar {
	width: 400px;
	height: auto;
	border-radius: 100%; 
	margin-right: 30px;
}
h5.author-title {
	margin-bottom: 0.1em;
	font-weight: 600;
	font-size: 20px;
}
.author-description {
	line-height: 1.6em
}
.author-links a {
	font-size: 15px;
	line-height: 20px;
	float: left;
}
@media (max-width: 768px) {
	.author-box {
		padding: 20px;
		padding-bottom: 20px;
		margin-top: 100px;
		flex-direction: column;
		text-align: center;
	}
	.author-box .avatar {
		margin-right: 0;
		margin-bottom: 40px;
		width: 100%;
		margin-top: -35px;
	}
	.author-box .avatar img {
		max-width: 100px;
	}
	.author-links a {
		float: none;
		align-self: center;
	}
	.author-description {
	text-align: left;
}
}

I just want to delelte the avatar/photo/gravatar on author box. How/which line should I delelte?

Thanks