$('.color-gl').mouseenter(function(event) {
$('.color-tah').fadeOut(300);
$('.grey-tah').fadeIn(300);
$('.color-dop').fadeOut(300);
$('.grey-dop').fadeIn(300);
$('.color-med').fadeOut(300);
$('.grey-med').fadeIn(300);
}).mouseleave(function(event) {
$('.color-tah').fadeIn(300);
$('.grey-tah').fadeOut(300);
$('.color-dop').fadeIn(300);
$('.grey-dop').fadeOut(300);
$('.color-med').fadeIn(300);
$('.grey-med').fadeOut(300);
});
<div class="col-12"></div>
<div class="row">
<div class="col-auto">
<a href="#" class="button button_right">Скачать</a>
</div>
<div class="col-auto">
<a href="#" class="button">Подробности</a>
</div>
</div>
.blue, .red, .green, .grey, .yellow {height: 150px;}
.blue {background: blue;}
.red {background: red;}
.green {background: green; height: 300px;}
.grey {background: grey;}
.yellow {background: yellow;}
<div class="container-fluid">
<div class="row">
<div class="col-sm-8">
<div class="row">
<div class="col-sm-12 blue">синий блок</div>
<div class="clearfix"></div>
<div class="col-sm-12 red">красный блок</div>
</div>
</div>
<div class="col-sm-4">
<div class="col-sm-12 green">зеленый блок</div>
<div class="clearfix"></div>
<div class="col-sm-12 grey">серый блок</div>
<div class="clearfix"></div>
<div class="col-sm-12 yellow">желтый блок</div>
</div>
</div>
</div>
.header.hide{top: -158px; transition: top .15s ease-in-out;}
.header {background: #fff; border-bottom: 1px solid #eee; position: absolute; z-index: 100; top: 0; left: 0; right: 0;}
$(window).scroll(function () {
if ($(this).scrollTop() > 75) {
$('.header').addClass('hide');
return false;
} else if ($(this).scrollTop() < 158) {
$('.header').removeClass('hide');
return false;
}
});
if ($(window).scrollTop() > 75) {
$('.header').addClass('hide');
return false;
}