HamSter

$(window).scroll(function(){
  if($(this).scrollTop() > 1){
    $('.nav').addClass('sticky');
  } else {
    $('.nav').removeClass('sticky');
  }
});

<form >
  
  <input type="radio" name="name" id="r-1" class="input" checked>
  <input type="radio" name="name" id="r-2" class="input">
  <input type="radio" name="name" id="r-3" class="input">
  
  
    <label for="r-1" class="label l-1">Текст 1</label>
    <label for="r-2" class="label l-2">Текст 2</label>
    <label for="r-3" class="label l-3">Текст 3</label>
  
</form>

.label {
  display: none;
}

#r-1:checked~.l-1,
#r-2:checked~.l-2,
#r-3:checked~.l-3{
  display: block;
}

ul {
  column-count: 2;    
  column-gap: 0;
  position: relative;
}

    * Текст     

    * Текст     

         
         
    * Текст     
         
         

<br/>
<br/>
&nbsp;&nbsp;&nbsp;&nbsp;* Текст &nbsp;&nbsp;&nbsp;&nbsp;
<br/>
<br/>

#nav ul { position: relative; }

#nav ul li div.block {
    width: initial;
    ...
    position: absolute;
    left: 0;
    right: 0;
}

<div class="wrap">
  <div class="box box-1"></div>
  <div class="box box-2"></div>
</div>

.box-1 {
  width: 5rem;
  height: 10rem;
  background: #000;
}

.box-2 {
  width: 10rem;
  height: 5rem;
  border: .25rem solid #000;
  margin-left: -5px;
}

.box {
  display: inline-block;
  vertical-align: middle;
}

<div class="wrap">
  <div class="box box-1"></div>
  <div class="box box-2"></div>
</div>


.box-1 {
  width: 5rem;
  height: 10rem;
  background: #000;
}

.box-2 {
  width: 10rem;
  height: 5rem;
  border: .25rem solid #000;
}

.wrap {
  display: flex;
  flex-flow: row nowrap;
  align-items: center;
}

<div class="wrap">
  <div class="box box-1"></div>
  <div class="box box-2"></div>
</div>


.box-1 {
  width: 5rem;
  height: 10rem;
  background: #000;
}

.box-2 {
  width: 10rem;
  height: 5rem;
  border: .25rem solid #000;
  margin-top: 2rem;
}

.box {
  float: left;
}

<div class="pointer">
  <a href="#" class="disabled">disabled link</a>
</div>

.pointer {
  cursor: pointer !important;
}

.disabled {
  pointer-events: none;
}