Widget:BoostCalcForm

<form class="boostCalc__form" data-target="calcBoostForm">

           <select name="boostType" class="boostCalc__select" id="boostType">
               <option value="2">2</option>
               <option value="3">3</option>
               <option value="5">5</option>
               <option value="10">10</option>
           </select>

           <label class="boostCalc__label" for="boostType">Selecione o tipo do boost</label>

           <input placeholder=" " type="checkbox" name="specialBoost" id="specialBoostCheckbox">
           <label for="specialBoostCheckbox">Você irá usar metal, crystal ou ancient stone ?</label>

           <input placeholder=" " name="stonePrice" id="stonePrice" class="boostCalc__input" type="number">
           <label class="boostCalc__label" for="stonePrice">Digite o preço da stone (Opcional)</label>

           <input placeholder=" " name="stonePrice" id="stonePrice" class="boostCalc__input" type="number">
           <label class="boostCalc__label" for="stonePrice">Digite o preço da Boost stone (Opcional)</label>

           <input placeholder=" " name="startBoost" id="startBoost" class="boostCalc__input" min="0" max="49"
               type="number">
           <label class="boostCalc__label" for="startBoost">Digite o boost atual</label>

           <input placeholder=" " name="endBoost" id="endBoost" class="boostCalc__input" min="1" max="50"
               type="number">
           <label class="boostCalc__label" for="endBoost">Digite o boost desejado</label>

<button type="submit" style="background:none;border:none;"> <img src=https://wiki.pokexgames.com/images/d/d3/Banner_calculadora.png alt="Imagem botão calcular boost" /> </button>

   </form>