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HTML 

              
                <!-- transparent fullscreen background -->
<div class="mlctr-underlayer">
 
  <!-- master popup div container -->
  <div class="mlctr-popup">
 
    <a class="mlctr-close" onclick="mailocator.action.do('close')"></a>
    <!-- following onsubmit event is required -->
    <form onsubmit="return mailocator.action.do('subscribe')" id="MailocatorForm">
       <!-- following div will be overwritten with success message -->
       <div class="mlctr-message-success" style="display:block">
         <div class="mlctr-red-box"><img src="https://cli.mlctr.com/cli001/webtop100/Logo.png"></div>
         <h2>Buďte vždy v&nbsp;obraze!</h2>
         <p class="mlctr-hexa">Případové studie <b>inspirativních digitálních projektů</b></p>
         <p class="mlctr-hexa"><b>Nejnovější podcasty</b> s&nbsp;osobnostmi českého digitálu</p>
         <p class="mlctr-hexa">Další <b>aktuality</b> do vašeho e-mailu</p>
         <div class="mlctr-message-error"><!-- all customized error messages will be placed here -->
         </div>
           <label></label>
           <!-- input with attribute name="email" is required -->
           <input type="text" name="email" value="" placeholder="Zadejte váš e-mail" /><input type="submit" value="ODEBÍRAT" />
         <div class="mlctr-privacy">Souhlasím se zpracováním osobních údajů pro účely zasílání obchodního sdělení.
         </div>
       </div>
       <!-- following div will replace the "mlctr-message-success" div -->
       <div class="mlctr-message-thanks" style="display:none">
         <div class="mlctr-red-box"><img src="https://cli.mlctr.com/cli001/webtop100/Logo.png"></div>
         <div class="mlctr-thx"></div>
         <h2>Děkujeme!</h2>
         <h3>Nyní Vám už nic <b>z&nbsp;naší produkce</b> neuteče.</h3>
         <!-- following event closes popup by users action -->
         <input type="button" value="ZAVŘÍT" onclick="mailocator.action.do('close')" />
       </div>
    </form>

   </div><!--/end of my-popup-container -->

</div><!--/end of my-popup-background-layer -->
!

CSS 

              
                @import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@300;400;500;700;800&display=swap');

/* transparent fullscreen background */
.mlctr-underlayer {
  position: fixed;
  width: 100%;
  height: 100%;
  top:0;
  left:0;
  background: rgba(0,0,0,0.8);
  font-size: 14px;
  font-family: 'Montserrat', Arial, sans-serif;
  z-index: 9999;
} 

/* master popup div container */
.mlctr-popup {
  position: fixed;
  left: 50%;
  top: 50%;
	transform: translate(-50%, -50%);
  width: 680px;
  height: 320px;
  background: #ffffff;
  padding: 50px 30px 0 260px;
  text-align: left;
  border-radius: 0px;
  box-sizing: border-box;
  box-shadow: 2px 5px 20px RGBA(0,0,0,0.3);
  -moz-box-shadow: 2px 5px 20px RGBA(0,0,0,0.3);
  -webkit-box-shadow: 2px 5px 20px RGBA(0,0,0,0.3);
}
.mlctr-close {
  display: block;
  position: absolute;
  right: 15px;
  top: 15px;
  width: 20px;
  height: 20px;
  background: url(https://cli.mlctr.com/cli001/webtop100/Close.png) center center no-repeat;
  background-size: 18px 18px;
  cursor: pointer;
  -webkit-transition: -webkit-transform 0.5s;
  -moz-transition: -moz-transform 0.5s;
  -o-transition: -o-transform 0.5s;
  transition: transform 0.5s;
}
.mlctr-close:hover {
  -webkit-transform: rotate(270deg);
  -moz-transform: rotate(270deg);
  -o-transform: rotate(270deg);
  transform: rotate(270deg);
}
.mlctr-close:active {
  background-size: 16px 16px;
}
.mlctr-red-box {
  display: block;
  position: absolute;
  text-align: center;
  padding: 115px 0 0;
  left: 0px;
  top: 0px;
  width: 220px;
  height: 320px;
	border: 1px solid #b1403c;
  background: #e43f36;
  box-sizing: border-box;
}
.mlctr-thx {
  display: block;
  position: relative;
  width: 51px;
  height: 36px;
  background: url(https://cli.mlctr.com/cli001/webtop100/Hexagons.png) center center no-repeat;
  background-size: 51px 36px;
  margin: 0 0 18px 0;
  box-sizing: border-box;
}
.mlctr-popup h1 {
  width: 100%;
  font-size: 40px;
  line-height: 40px;
  font-weight: 700;
  color: #000;
  padding: 0px;
  margin: 0;
  box-sizing: border-box;
}
.mlctr-popup h2 {
  width: 100%;
  font-size: 28px;
  line-height: 44px;
  font-weight: 800;
  color: #000;
  padding: 0px;
  margin: 0 0 10px 0;
  box-sizing: border-box;
}
.mlctr-popup h3 {
  width: 100%;
  font-size: 14px;
  line-height: 20px;
  font-weight: 500;
  color: #000;
  padding: 0;
  margin: 15px 0 0 0;
  box-sizing: border-box;
}
.mlctr-popup p {
  position: relative;
  width: 100%;
  font-size: 12px;
  line-height: 20px;
  font-weight: 500;
  color: #000;
  padding: 15px 0 0 0;
  margin: 0 0 7px 0;
  box-sizing: border-box;
}
.mlctr-popup p.mlctr-hexa {
  padding: 1px 0 0 26px;
}
.mlctr-popup p.mlctr-hexa:before {
  position: absolute;
  left: 0px;
  top: 0px;
  content: '';
  width: 18px;
  height: 21px;
  background: url(https://cli.mlctr.com/cli001/webtop100/Hexagon.png) center center no-repeat;
  background-size: 18px 21px;
}
.mlctr-message-error {
  display: block;
  width: 100%;
  height: 20px;
  line-height: 20px;
  font-size: 11px;
  margin: 5px 0 2px 0;
  padding: 0 ;
  font-weight: 600;
  text-align: left;
  color: #e43f36;
  box-sizing: border-box;
}
.mlctr-popup ::-webkit-input-placeholder {color: #b2b2b2; }
.mlctr-popup :-moz-placeholder { color: #b2b2b2; opacity: 1; }
.mlctr-popup ::-moz-placeholder { color: #b2b2b2; opacity: 1; }
.mlctr-popup :-ms-input-placeholder { color: #b2b2b2; }
.mlctr-popup :input-placeholder { color: #b2b2b2; }

.mlctr-popup input[type="text"] {
  width: 240px;
  height: 37px;
  font-family: inherit;
  font-size: 12px;
  font-weight: 500;
  line-height: 16px;
  padding: 2px 24px;
  background-color: #fff;
  border: 1px solid #cacdcf;
  border-radius: 0px;
  -moz-border-radius: 0px;
  -webkit-border-radius: 0px;
  color: #645b5b;
  text-align: left;
  margin: 0;
  -webkit-transition: all ease-in-out .15s;
  -moz-transition: all ease-in-out .15s;
  transition: all ease-in-out .15s;
  box-sizing: border-box;
}
.mlctr-popup input[type="text"]:focus {
	border: 1px solid #e43f36;
  outline: 0;
}
.mlctr-popup input[type="submit"], .mlctr-popup input[type="button"] {
  position: relative;
  width: 135px;
  height: 37px;
  font-family: inherit;
  font-size: 14px;
  line-height: 16px;
  font-weight: 700;
  padding: 2px 10px;
  margin: 0;
	border: 0px solid #e43f36;
  border-radius: 0px;
  -moz-border-radius: 0px;
  -webkit-border-radius: 0px;
  background-color: #e43f36;
  color: #ffffff;
  -webkit-transition: -webkit-all 0.5s;
  -moz-transition: -moz-transform 0.5s;
  -o-transition: -o-transform 0.5s;
  transition: transform 0.5s;
  cursor: pointer;
  box-sizing: border-box;
  outline: 0;
}
.mlctr-popup input[type="button"] {
  margin: 40px 0 0 0;
}
.mlctr-popup input[type="submit"]:hover, .mlctr-popup input[type="button"]:hover {
  letter-spacing: 0.3px;
  background-color: #f1493f;
}
.mlctr-popup input[type="submit"]:active, .mlctr-popup input[type="button"]:active {
  letter-spacing: -0.2px;
}
.mlctr-privacy {
  position: relative;
  width:100%;
  display: block;
  text-align: left;
  font-size: 10px;
  line-height: 15px;
  font-weight: 500;
  color: #645b5b;
  padding: 0 30px 0 26px;
  margin: 18px 0 0;
  box-sizing: border-box;
}
.mlctr-privacy:before {
  position: absolute;
  left: 0px;
  top: 0px;
  content: '';
  width: 18px;
  height: 16px;
  background: url(https://cli.mlctr.com/cli001/webtop100/Check.png) center center no-repeat;
  background-size: 18px 16px;
}
.mlctr-popup .mlctr-privacy a {
  color: #645b5b;
  font-weight: 700;
}
!

JS
!
999px

Console