flexbox grid system

<div class="row">
  <div class="product col-lg-10">
    <div class="row">
      <div class="col-md-6">
        <div class="box col-xs-3">auto</div>
        <div class="box col-xs-3">auto</div>
        <div class="box col-xs-3">auto</div>
        <div class="box col-xs-3">auto</div>
      </div>
      <div class="col-md-6">
        <div class="box col-xs-3">auto</div>
        <div class="box col-xs-3">auto</div>
        <div class="box col-xs-3">auto</div>
        <div class="box col-xs-3">auto</div>
      </div>
    </div>
  </div>
  <div class="sidebar col-lg-2">
    <h1>последние новости</h1>
    <input type="text" name="subscribe" class="subscribe" placeholder="почтовый адрес">
    <button class="subscribe">Подписаться</button>
  </div>
</div>

Не могу понять почему мои боксы стали такие маленькие (были квардратные).lg в md в xs вставил но всё же криво всё стало. По правилам flexbox grid всё должно быть вложено в row и col. В сумме должны составлять сумму 12 вот я попробовал и получилось криво не знаю почему.

CSS:

/* font-family: "LiberationSansRegular"; */
@font-face {
    font-family: "LiberationSansRegular";
    src: url("../fonts/LiberationSansRegular/LiberationSansRegular.eot");
    src: url("../fonts/LiberationSansRegular/LiberationSansRegular.eot?#iefix")format("embedded-opentype"),
    url("../fonts/LiberationSansRegular/LiberationSansRegular.woff") format("woff"),
    url("../fonts/LiberationSansRegular/LiberationSansRegular.ttf") format("truetype");
    font-style: normal;
    font-weight: normal;
}
/* font-family: "LiberationSansBold"; */
@font-face {
    font-family: "LiberationSansBold";
    src: url("../fonts/LiberationSansBold/LiberationSansBold.eot");
    src: url("../fonts/LiberationSansBold/LiberationSansBold.eot?#iefix")format("embedded-opentype"),
    url("../fonts/LiberationSansBold/LiberationSansBold.woff") format("woff"),
    url("../fonts/LiberationSansBold/LiberationSansBold.ttf") format("truetype");
    font-style: normal;
    font-weight: normal;
}
/* font-family: "LiberationSansItalic"; */
@font-face {
    font-family: "LiberationSansItalic";
    src: url("../fonts/LiberationSansItalic/LiberationSansItalic.eot");
    src: url("../fonts/LiberationSansItalic/LiberationSansItalic.eot?#iefix")format("embedded-opentype"),
    url("../fonts/LiberationSansItalic/LiberationSansItalic.woff") format("woff"),
    url("../fonts/LiberationSansItalic/LiberationSansItalic.ttf") format("truetype");
    font-style: normal;
    font-weight: normal;
}
/* font-family: "LiberationSansBoldItalic"; */
@font-face {
    font-family: "LiberationSansBoldItalic";
    src: url("../fonts/LiberationSansBoldItalic/LiberationSansBoldItalic.eot");
    src: url("../fonts/LiberationSansBoldItalic/LiberationSansBoldItalic.eot?#iefix")format("embedded-opentype"),
    url("../fonts/LiberationSansBoldItalic/LiberationSansBoldItalic.woff") format("woff"),
    url("../fonts/LiberationSansBoldItalic/LiberationSansBoldItalic.ttf") format("truetype");
    font-style: normal;
    font-weight: normal;
}
body {
  margin: 0;
  font-family: LiberationSansRegular;
  line-height: 1.5;
}
nav {
  width: 100%;
  height: 53px;
  background: #fefefe;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1;
  font-family: LiberationSansBoldItalic;
}
.logo {
  width: 100px;
  height: 100px;
  margin-left: 3%;
  float: left;
}
nav ul{
    margin: 0;
    padding: 0;
    display: inline-block;
}
nav ul li {
    display: inline-block;
    white-space:nowrap;
}
nav > ul > li > a {
    color: #484848;
    display: block;
    text-decoration: none;
    padding: 17px 37px;
}
.colomn-cntr {
  width: 50px;
}
.enter {
  background-image: url(../img/search.png);
  background-repeat: no-repeat;
  background-position: 162px;
  outline: none;
  padding-right: 25px;
  height: 26px;
  font-size: 13px;
}
.btnEnter {
  border: none;
  background-color: #fff;
  height: 26px;
  font-size: 15px;
  font-family: LiberationSansBoldItalic;
}
.parallax {
  perspective: 1px;
  height: 100vh;
  overflow-x: hidden;
  overflow-y: auto;
}
.hero {
  background: #00f;
  height: 100vh;
  transform: translateZ(-1px) scale(2);
}
img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.row {
  background: #fff;
  height: 100%;
  position: relative;
  padding: 0 6%;
}
.box {
  margin: 22px;
  background: #cfcfcf;
  height: 207px;
}
.sidebar {
  height: 270px;
  border: solid 3px #ddd;
  margin-top: 20px; 
}
.subscribe {
  border: solid #83cdbc 2px;
  background-color: #fff;
  margin: 5px;
}
.footer {
  height: 480px;
  padding: 0 6%;
  display: flex;
  justify-content: space-around;
}
a>img {
  height: 32px;
  width: 32px;
  }
ul>li {
  display: inline-block;
}
a {
  text-decoration: none;
}