ul{
  list-style: none;
}

.container{
  width: 80%;
  margin: 0 auto;
}

.column{
  box-sizing: border-box;
  width: 33.3333333333333333333333333333333333333333333333333333333333%;
  padding: 15px;
}

.float-left{
  float: left;
}

.float-right{
  float: right;
}

.block{
  display: block;
}

.width-40{
  width: 40%;
}

.inline-block{
  display: inline-block;
  width: 40%;
  margin-left: 5%;
}

.inline{
  display: inline;
  border-radius: 3px;
  color: orange;
}

.clearfix{
  clear: both;
}

.back-btn{
  top: 200px;
  left: 0;
  display: inline-block;
  border-radius: 3px;
  color: white;
  text-decoration: none;
  padding: 20px;
}

.legends li *{
  display: inline-block;
  margin-right: 10px;
}

.legend{
  width: 20px;
  height: 20px;
}

.positions-div{
  width: 100%;
  height: 500px;
}

.box{
  width: 100px;
  height: 100px;
}

.relative{
  position: relative;
}

.static{
  position: static;
  top: 100px;
  left: 200px;
}

.absolute{
  position: absolute;
  top: 100px;
  left: 200px;
}

.fixed{
  position: fixed;
}

.red-bg{
  background: red;
}

.blue-bg{
  background: blue;
}

.green-bg{
  background: green;
}

.black-bg{
  background: black;
}

.red-border{
  border: 1px solid red;
}

.blue-border{
  border: 1px solid blue;
}

.green-border{
  border: 1px solid green;
}

.box-model1, .box-model2{
  width: 300px;
  margin-right: 10px;
  padding-left: 10px;
  color: white;
  background: blue;
  border: 5px solid red;
}

.box-model2{
  box-sizing: border-box;
}