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HTML 

              
                <main id="app">

<h3 class="instructions">Choose your toppins and order! <i class="em em-drooling_face"></i> </h3>

<div class="screen">
  <button class="menu">back to menu</button>
  <div class="product-wrapper">
    <div class="product-info">
  <h1>Protein Waffle</h1>
  <div class="price">$10.99</div>
  <ul class="macros">
    <li>25g protein</li>
    <li>30g carbs</li>
    <li>18g fat</li>
      </ul>
    </div>
      <div class="waffle-img-wrapper">
        <img class="waffle-img" src="https://i.ibb.co/YRCYSrF/Waffle.png" alt="Waffle" border="0"></a>
      </div>
   </div>

<div class="checkout-wrapper">
  
  <div class="extras-wrapper">
    <div class="extra peanut-butter" onclick=toggleCheckmark(this)  v-on:click="updatePrice(peanutButter, 'peanutButter')">
      <svg class="add-icon" width="32" height="32" fill="none" xmlns="http://www.w3.org/2000/svg">
  <path fill-rule="evenodd" clip-rule="evenodd" d="M32 16c0 8.837-7.163 16-16 16S0 24.837 0 16 7.163 0 16 0s16 7.163 16 16zM14 8a2 2 0 1 1 4 0v6h6a2 2 0 1 1 0 4h-6v6a2 2 0 1 1-4 0v-6H8a2 2 0 1 1 0-4h6V8z" fill="#fff"/>
</svg>
      <svg class="checkmark-icon" width="32" height="32" fill="none" xmlns="http://www.w3.org/2000/svg">
  <path fill-rule="evenodd" clip-rule="evenodd" d="M16 32c8.837 0 16-7.163 16-16S24.837 0 16 0 0 7.163 0 16s7.163 16 16 16zm-5.69-16.011a2 2 0 0 0-2.62 3.021l4.82 4.182a3 3 0 0 0 4.185-.247l8.284-9.099a2 2 0 0 0-2.958-2.693l-7.627 8.377-4.084-3.541z" fill="#CD8821"/>
</svg>

      <div class="extra-text">Peanut butter</div>
      
    </div>
    <div class="extra yogurt" onclick=toggleCheckmark(this) v-on:click="updatePrice(yogurt, 'yogurt')">
        <svg class="add-icon" width="32" height="32" fill="none" xmlns="http://www.w3.org/2000/svg">
  <path fill-rule="evenodd" clip-rule="evenodd" d="M32 16c0 8.837-7.163 16-16 16S0 24.837 0 16 7.163 0 16 0s16 7.163 16 16zM14 8a2 2 0 1 1 4 0v6h6a2 2 0 1 1 0 4h-6v6a2 2 0 1 1-4 0v-6H8a2 2 0 1 1 0-4h6V8z" fill="#fff"/>
</svg>
      <svg class="checkmark-icon" width="32" height="32" fill="none" xmlns="http://www.w3.org/2000/svg">
  <path fill-rule="evenodd" clip-rule="evenodd" d="M16 32c8.837 0 16-7.163 16-16S24.837 0 16 0 0 7.163 0 16s7.163 16 16 16zm-5.69-16.011a2 2 0 0 0-2.62 3.021l4.82 4.182a3 3 0 0 0 4.185-.247l8.284-9.099a2 2 0 0 0-2.958-2.693l-7.627 8.377-4.084-3.541z" fill="#EE6F6F"/>
</svg>
      <div class="extra-text">Yogurt</div></div>
    <div class="extra mixed-berries" onclick=toggleCheckmark(this) v-on:click="updatePrice(mixedBerries, 'mixedBerries')">
        <svg class="add-icon" width="32" height="32" fill="none" xmlns="http://www.w3.org/2000/svg">
  <path fill-rule="evenodd" clip-rule="evenodd" d="M32 16c0 8.837-7.163 16-16 16S0 24.837 0 16 7.163 0 16 0s16 7.163 16 16zM14 8a2 2 0 1 1 4 0v6h6a2 2 0 1 1 0 4h-6v6a2 2 0 1 1-4 0v-6H8a2 2 0 1 1 0-4h6V8z" fill="#fff"/>
</svg>
      <svg class="checkmark-icon" width="32" height="32" fill="none" xmlns="http://www.w3.org/2000/svg">
  <path fill-rule="evenodd" clip-rule="evenodd" d="M16 32c8.837 0 16-7.163 16-16S24.837 0 16 0 0 7.163 0 16s7.163 16 16 16zm-5.69-16.011a2 2 0 0 0-2.62 3.021l4.82 4.182a3 3 0 0 0 4.185-.247l8.284-9.099a2 2 0 0 0-2.958-2.693l-7.627 8.377-4.084-3.541z" fill="#AD5AE0"/>
</svg>
      <div class="extra-text">Mixed berries</div></div>
    <div class="extra apple-cinnamon" onclick=toggleCheckmark(this) v-on:click="updatePrice(appleCinnamon, 'appleCinnamon')">
        <svg class="add-icon" width="32" height="32" fill="none" xmlns="http://www.w3.org/2000/svg">
  <path fill-rule="evenodd" clip-rule="evenodd" d="M32 16c0 8.837-7.163 16-16 16S0 24.837 0 16 7.163 0 16 0s16 7.163 16 16zM14 8a2 2 0 1 1 4 0v6h6a2 2 0 1 1 0 4h-6v6a2 2 0 1 1-4 0v-6H8a2 2 0 1 1 0-4h6V8z" fill="#fff"/>
</svg>
      <svg class="checkmark-icon" width="32" height="32" fill="none" xmlns="http://www.w3.org/2000/svg">
  <path fill-rule="evenodd" clip-rule="evenodd" d="M16 32c8.837 0 16-7.163 16-16S24.837 0 16 0 0 7.163 0 16s7.163 16 16 16zm-5.69-16.011a2 2 0 0 0-2.62 3.021l4.82 4.182a3 3 0 0 0 4.185-.247l8.284-9.099a2 2 0 0 0-2.958-2.693l-7.627 8.377-4.084-3.541z" fill="#65B257"/>
</svg>
      <div class="extra-text">Apple Cinnamon</div></div>
    
     <div class="extra-price">+$2.99 extra</div>
    
    </div>
  
  <div class="divider"></div>
  
  <div class="total-wrapper">
    
    <div>Total</div>
    <div>$ {{ price.toFixed(2) }}</div>
    
  </div>
  
  <button class="eat-it-now">Eat it now</button>
  </div>


</div>
</main>
!

CSS 

              
                body {
  font-family: Nunito Sans;
background: linear-gradient(180deg, #5E1A88 -41.27%, #340451 123.8%);

}

.instructions {
  text-align: center;
  margin-top: 30px;
  color: #E7CCF8;
}

.screen {
  width: 375px;
  height: 812px;
  background-color: #F1F1F1;
  margin: auto;
  margin-top: 30px;
  margin-bottom: 50px;
  border-radius: 10px;
  box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.1);
}

.menu {
  width: 178px;
  height: 40px;
  cursor: pointer;
  background: #ffffff;
  border: none;
  border-radius: 0px 5px 5px 0px;
  font-size: 16px;
  font-weight: 300;
  text-align: center;
  color: #6B6B6B;
  margin-top: 56px;
}

h1 {
  font-family: Roboto Condensed;
  font-weight: bold;
  font-size: 36px;
  text-transform: uppercase;
  margin-left: 40px;
  margin-bottom: 16px;
  width: 134px;
}

.price {
  margin-left: 40px;
  font-size: 24px;
  font-weight: 300;
}

.macros {
  margin-left: 0px;
  color: #6B6B6B;
  font-size: 16px;
  font-weight: 300;
  list-style: none;
}

.product-wrapper {
  display: flex;
  justify-content: space-between;
}

.waffle-img {
  height: 301px;
}

.checkout-wrapper {
  background-color: #ffffff;
  height: 409px;
  border-radius: 0px 0px 10px 10px;

}


.extras-wrapper {
  display: flex;
  width: 264px;
  height: 264px;
  flex-wrap: wrap;
  margin-left: 36px;
  position: relative;
  top: -45px;
 
  
}

.extra {
  
  background-color: grey;
  height: 124px;
  width: 124px;
  font-size: 18px;
  font-weight: 700;
  text-align: center;
  border-radius: 15px;
  margin: 4px;
  transition: all 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
  position: relative;
 

}

.add-icon {
margin: auto;
  margin-top: 16px;
}

.checkmark-icon {
  display: none;
  margin: auto;
  margin-top: 16px;

}
.extra-text {
  height: 40px;
  line-height: 20px;
  padding: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  left: 0;
  right: 0;
  top: 52px;
  
 
}

.hidden {
  display: none;
}

.visible {
  display: block;
}

.peanut-butter {
  background-color: #FFE1B4;
  color: #CD8821;
  
  &:hover {
  background-color: #FFDAA1;
    transform: translatey(1px);
}  
  
}

.peanut-butter.selected {
  
  background-color: #FFDAA1;
  // outline: 3px solid #CD8821;
  // outline-offset: -8px;
  // box-shadow: 0px 0px 0px 2px #FDCB7F inset;
}

.yogurt {
  background-color: #FFCECE;
  color: #EE6F6F;
  
    &:hover {
  background-color: #FFC8C8;

      transform: translatey(1px);
}
  
}

.yogurt.selected {
  background-color: #FFC8C8;

}

.mixed-berries {
  background-color: #E7CCF8;
   color: #AD5AE0;
  
     &:hover {
  background-color: #E8C2FF;
 
       transform: translatey(1px);
}
  
}

.mixed-berries.selected {
   background-color: #E8C2FF;

}

.apple-cinnamon {
  background-color: #CFF1C9;
   color: #65B257;
  
      &:hover {
  background-color: #C0EEB7;

        transform: translatey(1px);
}
  
}

.apple-cinnamon.selected {
    background-color: #C0EEB7;
  box-shadow: inset 0px 6px 0px #BDEAB5;
}

.extra-price {
  color: #6B6B6B;
  font-weight: 300;
  font-size: 16px;
  transform: rotate(-90deg);
  position: absolute;
right: -74px;
top: 125px;
  
}

.divider {
  height: 4px;
  width: 295px;
  margin: auto;
  background-color: #F1F1F1;
  position: relative;
  top: -28px;
  
}

.total-wrapper {
  margin-left: 40px;
  margin-right: 40px;
  margin-top: 18px;
  margin-bottom: 20px;
  font-weight: 300;
  font-size: 16px;
  display: flex;
  justify-content: space-between;
  position: relative;
  top: -30px;
}

.eat-it-now {
  width: 295px;
  height: 50px;
  cursor: pointer;
  background: #AD5AE0;
  border: none;
  border-radius: 8px;
  font-size: 18px;
  font-weight: 700;
  text-align: center;
  color: #ffffff;
  margin-left: 40px;
  position: relative;
  top: -30px;
  transition: all 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
  
  
   &:hover {
    transform: translatey(1px);
    background: #A044D9;
     box-shadow: 0px 2px 10px rgba(160, 68, 217, 0.4);
  }
  
}
!

JS 

              
                function toggleCheckmark(extra) {
  // Toogle the icon
  extra.querySelector(".add-icon").classList.toggle("hidden")
  extra.querySelector(".checkmark-icon").classList.toggle("visible") 
  // Toogle the background
  extra.classList.toggle("selected")
}

var app = new Vue({
  el: '#app',
  data: {
    price: 10.99,
    peanutButter: false,
    yogurt: false,
    mixedBerries: false,
    appleCinnamon: false
  },
  methods: {
    updatePrice: function(extra, extraString) {
      if (extra === false)  {
        this.price += 2.99
      } else {
        this.price -= 2.99
      }
this[extraString] = !extra
    }
  }
})
!
999px

Console