//Вопрос// Как убрать margin у каждого четвёртого блока

by Alexander Lashchevsky

HTML

<div class="wrapper">
    <div class="block"></div>
    <div class="block"></div>
    <div class="block"></div>
    <div class="block"></div>
    <div class="block"></div>
    <div class="block"></div>
    <div class="block"></div>
    <div class="block"></div>
    <div class="block"></div>
    <div class="clear"></div>
</div>

CSS

.wrapper {
    width: 110px; 
    background: red;
}
.block {
    float: left;
    width: 20px; 
    height: 20px; 
    margin-right: 10px; 
    margin-bottom: 10px; 
    background: green;
}
.block:nth-of-type(4n) {
    margin-right: 0;
}
.clear {
    width: 100%; 
    height: 1px; 
    clear: both;
}