Hiding billing section when "same as shipping address" checkbox is clicked?

How would I make it so that when the "Same as shipping address" checkbox is clicked, the billing address section will be hidden? I've been stuck on this for awhile now and decided to come here for help. Thank you very much in advance!

(posting some words here since I can't post due to having more code than text so ignore this part)

I attached a snipped below of my code so hopefully this helps:

.checkbox-custom, .radio-custom {
    margin: 0 auto;
    width: 40%;
    opacity: 0;
    position: absolute;   
}

.checkbox-custom, .checkbox-custom-label, .radio-custom, .radio-custom-label {
    display: inline-block;
    vertical-align: middle;
    margin: 5px;
    cursor: pointer;
}

.checkbox-custom-label, .radio-custom-label {
    position: relative;
}

.checkbox-custom + .checkbox-custom-label:before, .radio-custom + .radio-custom-label:before {
    content: '';
    background: #fff;
    border: 1px solid #717171;
    display: inline-block;
    vertical-align: middle;
    width: 20px;
    height: 20px;
    padding: 2px;
    margin-right: 10px;
    text-align: center;
}

.checkbox-custom:checked + .checkbox-custom-label:before {
    content: "\f00c";
    font-family: 'FontAwesome';
    font-size: 20px;
    color: #a1cdad;
}

.radio-custom + .radio-custom-label:before {
    border-radius: 50%;
}

.radio-custom:checked + .radio-custom-label:before {
    content: "\f00c";
    font-family: 'FontAwesome';
    font-size: 20px;
    color: #a1cdad;
}

  <form class="form1">
      
    <h6>Shipping Address</h6>  
      
    <div class="input-box">
      <input type="text" id="first-name" placeholder="John" data-type="name"/>
      <label for="first-name"><p>First Name</p></label>
    </div>
    
    <div class="input-box">
      <input type="text" id="last-name" placeholder="Smith" data-type="name"/>
      <label for="last-name"><p>Last Name</p></label>
    </div>
    
    <div class="input-box">
      <input type="text" id="phone-number" placeholder="555-555-555" data-type="number"/>
      <label for="phone-number"><p>Phone Number</p></label>
    </div>
      
    <div class="input-box">
      <input type="text" id="company" placeholder="Company" data-type="name"/>
      <label for="company"><p>Company Name</p></label>
    </div>  
      
    <div class="input-box">
      <input type="text" id="address" placeholder="123 Main Street" data-type="text"/>
      <label for="address" data-type="name"><p>Address</p></label>
    </div>
      
    <div class="input-box">
      <input type="text" id="city" placeholder="Everytown" data-type="text"/>
      <label for="city" data-type="name"><p>City</p></label>
    </div>
      
    <div class="input-box">
      <select id="card-type">
        <option><p>Texas</p></option>
        <option><p>Louisiana</p></option>
        <option><p>New Mexico</p></option>
        <option><p>Oklahoma</p></option>
      </select>
      <label for="card-type"><p>State</p></label>
    </div>
      
    <div class="input-box">
      <input type="text" id="zip" placeholder="12345" data-type="text"/>
      <label for="zip" data-type="text"><p>Address</p></label>
    </div>
      
    <div class="input-box">
      <select id="card-type">
        <option><p>United States</p></option>
      </select>
      <label for="card-type"><p>Country</p></label>
    </div>
      
    <div class="input-box">
      <input type="text" id="email" placeholder="johnsmith@gmail.com" data-type="email"/>
      <label for="email"><p>Email Address</p></label>
    </div>  
      
  </form>
    
  <form class="form2">
     
    <h6>Billing Address</h6> 
      
    <div>
        <input id="checkbox-1" class="checkbox-custom" name="checkbox-1" type="checkbox" checked>
        <label for="checkbox-1" class="checkbox-custom-label">Same as shipping address</label>
    </div>
      
    <div class="input-box">
        <input type="text" id="first-name" placeholder="John" data-type="name"/>
        <label for="first-name"><p>First Name</p></label>
    </div>
    
    <div class="input-box">
        <input type="text" id="last-name" placeholder="Smith" data-type="name"/>
        <label for="last-name"><p>Last Name</p></label>
    </div>
    
    <div class="input-box">
        <input type="text" id="phone-number" placeholder="555-555-555" data-type="number"/>
        <label for="phone-number"><p>Phone Number</p></label>
    </div>
      
    <div class="input-box">
        <input type="text" id="company" placeholder="Company" data-type="name"/>
        <label for="company"><p>Company Name</p></label>
    </div>  
      
    <div class="input-box">
        <input type="text" id="address" placeholder="123 Main Street" data-type="text"/>
        <label for="address" data-type="name"><p>Address</p></label>
    </div>
      
    <div class="input-box">
        <input type="text" id="city" placeholder="Everytown" data-type="text"/>
        <label for="city" data-type="name"><p>City</p></label>
    </div>
      
    <div class="input-box">
      <select id="card-type">
        <option><p>Texas</p></option>
        <option><p>Louisiana</p></option>
        <option><p>New Mexico</p></option>
        <option><p>Oklahoma</p></option>
      </select>
      <label for="card-type"><p>State</p></label>
    </div>
      
    <div class="input-box">
      <input type="text" id="zip" placeholder="12345" data-type="text"/>
      <label for="zip" data-type="text"><p>Address</p></label>
    </div>
      
    <div class="input-box">
      <select id="card-type">
        <option><p>United States</p></option>
      </select>
      <label for="card-type"><p>Country</p></label>
    </div>
      
    <div class="input-box">
      <input type="text" id="email" placeholder="johnsmith@gmail.com" data-type="email"/>
      <label for="email"><p>Email Address</p></label>
    </div>  
      
  </form>