How to make the header a normal size?

Question

css

Hello everyone, I ran into such a problem: the width is not filled with a picture, but the height, on the contrary, moves out, please help.
Screen:

code:

<div class="slider-section" style="background-image: url(images/background2.jpg);">
    <div id="clockdiv">
      <div>
        <span class="days"></span>
        <div class="smalltext">Дней</div>
      </div>
      <div>
        <span class="hours"></span>
        <div class="smalltext">Часов</div>
      </div>
      <div>
        <span class="minutes"></span>
        <div class="smalltext">Минут</div>
      </div>
      <div>
        <span class="seconds"></span>
        <div class="smalltext">Секунд</div>
      </div>
    </div>		
  <div class="containers">  
      <form id="contact" action="" method="post">
        <h3>Colorlib Contact Form</h3>
        <h4>Contact us for custom quote</h4>
        <fieldset>
          <input placeholder="Your name" type="text" tabindex="1" required autofocus>
        </fieldset>
        <fieldset>
          <input placeholder="Your Email Address" type="email" tabindex="2" required>
        </fieldset>
        <fieldset>
          <input placeholder="Your Phone Number (optional)" type="tel" tabindex="3" required>
        </fieldset>
        <fieldset>
        <fieldset>
          <button name="submit" type="submit" id="contact-submit" data-submit="...Sending">Submit</button>
        </fieldset>
      </form>
    </div>
  </div>

css:"

.slider-section{
  background-size: contain;
  background-repeat: no-repeat;
  min-width: 2000px;
  max-height: 845px;
}

Answer 1

.slider-section{
background-size: cover;
background-position: center; either background-position: center top;
background-repeat: no-repeat;
min-width: 2000px
max-height: 845px;
}
min-width: 2000px----- Are you serious? What users are you making the site for?