icon does not show up on button ionic - html

Hi there I am trying to put a icon on one of my buttons that has a css class in my ionic project but when I do the icon does not show up heres my code down bellow. I have my css and my html/angular code down bellow, im trying to have 4 buttons nice and big next to each other and have a icon to make it look not so plain but when I do it does not show up
Thanks
Adam Weston
a{
text-decoration:none;
}
.buttontop{
display:inline-block;
padding:20px;
height:120px;
width:170px;
text-align:center;
background:white;
color:white;
font-size: 10px;
}
.active{
background:#188171;
}
<ion-header>
<ion-toolbar>
<ion-title>
Home
</ion-title>
</ion-toolbar>
</ion-header>
<ion-content>
<ion-card class="welcome-card">
<ion-img src="/assets/shapes.svg"></ion-img>
<ion-card-header>
<ion-card-title>Welcome to ATAM</ion-card-title>
</ion-card-header>
<ion-card-content>
ATAM is the Original Learning Center for Everything Technology, Art, Music and Recording. We blend creativity with genius, and foster entrepreneurship.
ATAM offers a huge variety of ways to learn through private instruction, group classes, advanced STEM/STEAM camps and through experimental game play.
</ion-card-content>
</ion-card>
<button ion-button icon-start>
<ion-icon name="star"></ion-icon>
Parties
</button>
<ion-button class="buttontop" expand="block">Sign up for Camp!
<ion-icon name="star"></ion-icon>
</ion-button>
<ion-button class="buttontop" expand="block">CreditCard Update</ion-button>
<ion-button class="buttontop" expand="block">Contact Us</ion-button>
<ion-card class="NewAtATAM">
<ion-img src="/assets/newatatam.jpg"></ion-img>
<ion-card-header>
<ion-card-title>New At ATAM</ion-card-title>
</ion-card-header>
</ion-card>
<ion-card class="SignupforMusiclessons">
<ion-img src="/assets/music.jpg"></ion-img>
<ion-card-header>
<ion-card-title>Sign Up For Music Lessons</ion-card-title>
</ion-card-header>
<ion-card-content>
acoustic - electric - music production - recording
ATAM Music Department teaches over 30 instruments, acoustic and digital, as well as music production and professional recording. Sign up now!
Private lessons are Monday through Saturday
12pm to 8pm
</ion-card-content>
<ion-button expand="block" color="dark" href="contact-us" >sign up</ion-button>
</ion-card>
<ion-card class="Signupforsummercamp">
<ion-img src="/assets/summercamp.jpg"></ion-img>
<ion-card-header>
<ion-card-title>Sign Up For Summer Camp</ion-card-title>
</ion-card-header>
<ion-card-content>
summer 2019 - tech- sports - art - music - field trips
Come experience ATAM Tech and Outdoor Summer Camp. The best of all worlds, combining tech, art, music, sports and field trips!
When: Monday-Friday, 8:30am to 3:30pm
June 10 - August 30
After Care Hours: 3:30 to 7:30.
</ion-card-content>
<ion-button expand="block" color="dark" href="camp">sign up</ion-button>
</ion-card>
<ion-card class="lessonsandclasses">
<ion-img src="/assets/lessonsandclasses.jpg"></ion-img>
<ion-card-header>
<ion-card-title>Lessons and Classes</ion-card-title>
<ion-button color="dark" expand="full" fill="solid" href="contact-us">Learn more about Private Lessons</ion-button>
</ion-card-header>
</ion-card>
<ion-card class="tech">
<ion-img src="/assets/TECHSQUARE.jpg"></ion-img>
<ion-card-header>
</ion-card-header>
<ion-card-content>
Robotics, Programming, Game Design, App Building, Website Design, Engineering, Architecture
</ion-card-content>
<ion-button expand="block" color="dark" href="contact-us">Start Learnig</ion-button>
</ion-card>
<ion-card class="music">
<ion-img src="/assets/MUSICSQUARE.jpg"></ion-img>
<ion-card-header>
</ion-card-header>
<ion-card-content>
30 Acoustic instruments, Music Production, Professional Recording Studios </ion-card-content>
<ion-button expand="block" color="dark" href="contact-us">Start Learning</ion-button>
</ion-card>
<ion-card class="art">
<ion-img src="/assets/ARTSQUARE.jpg"></ion-img>
<ion-card-header>
</ion-card-header>
<ion-card-content>
Traditional Art in all mediums, Digital Illustration using Industry Standard Software and Techniques
</ion-card-content>
<ion-button expand="block" color="dark" href="contact-us" >Start Learning</ion-button>
</ion-card>
<ion-list lines="none">
<ion-list-header>
<ion-label>Resources</ion-label>
</ion-list-header>
<ion-item href="parties">
<ion-icon slot="start" color="medium" name="book"></ion-icon>
<ion-label>Book A Party</ion-label>
</ion-item>
<ion-item href="camps">
<ion-icon slot="start" color="medium" name="build"></ion-icon>
<ion-label>Sign up For Summer Camp</ion-label>
</ion-item>
<ion-item href="regform">
<ion-icon slot="start" color="medium" name="grid"></ion-icon>
<ion-label>Registration Form</ion-label>
</ion-item>
<ion-item href="creditcard">
<ion-icon slot="start" color="medium" name="color-fill"></ion-icon>
<ion-label>Credit Card Update Form</ion-label>
</ion-item>
<ion-item href="contact-us">
<ion-icon slot="start" color="medium" name="color-fill"></ion-icon>
<ion-label>Contact US</ion-label>
</ion-item>
</ion-list>
</ion-content>

If you want to align these 4 button in single line you should use ion-row, have your buttons placed in their individual ion-col.
And another thing is, correct syntax is <button ion-button></button> not <ion-button></ion-button>
<ion-row>
<ion-col>
<button ion-button icon-start>
<ion-icon name="star"></ion-icon>
Parties
</button>
</ion-col>
<ion-col>
<button ion-button icon-start class="buttontop" expand="block">
<ion-icon name="star"></ion-icon>
Sign up for Camp!
</button>
</ion-col>
<!-- add rest of the buttons in their separate ion-col -->
</ion-row>

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