<form>
  <div class="form-group">
    <label for="exampleInputEmail1">Email address</label>
    <input type="email" class="form-control" id="exampleInputEmail1" aria-describedby="emailHelp" placeholder="Enter email">
    <small id="emailHelp" class="form-text text-muted">We'll never share your email with anyone else.</small>
  </div>
  <div class="form-group">
    <label for="exampleInputPassword1">Password</label>
    <input type="password" class="form-control" id="exampleInputPassword1" placeholder="Password">
  </div>
  <div class="form-group">
    <label for="exampleFormControlSelect1">Example select</label>
    <select class="form-control" id="exampleFormControlSelect1">
      <option>1</option>
      <option>2</option>
      <option>3</option>
      <option>4</option>
      <option>5</option>
    </select>
  </div>
  <div class="form-group form-check">
    <input type="checkbox" class="form-check-input" id="exampleCheck1" checked>
    <label class="form-check-label" for="exampleCheck1" >Check me out</label>
  </div>
  <input type="submit" class="btn btn-primary" value="Submit" />
  <input type="reset" class="btn btn-primary" value="Reset" />
</form>

body {
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 2vw;
  background: #eaeaea;
}

form {
  border-radius: 8px;
  padding: 20px;
  background: #fff;
  border: 1px solid #aeaeae;
  margin: 10px;
}

input:default {
  border: 2px solid red;
}