HTML, CSS and JavaScript playground

.content_a{
  max-width: 980px;
  margin: auto;
}
.content_a .a{
  max-width: 980px;
  margin: 50px 0;
  background: #EEEEEE;
  overflow: hidden;
  height: 80px;
    -webkit-border-radius: 4px;
  border-radius: 4px;
    -webkit-box-shadow: 0 0.5px 0.5px 0 #A3A3A3;
  box-shadow: 0 0.5px 0.5px 0 #A3A3A3;
}
.content_a .a_a{
  height: 80px;
  width: 20%;
  float: left;
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.content_a .a_a img{
  transition: all 0.5s ease;
  border: 0;
}
.content_a .a_a img:hover{
    -moz-transform: rotate(360deg);
    -webkit-transform: rotate(360deg);
    -o-transform: rotate(360deg);
    -ms-transform: rotate(360deg);
  transform: rotate(360deg);
  cursor: pointer;
}
.content_a .a_b{
  height: 80px;
  width: 80%;
  float: left;
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 10px;
}
.content_a .a_b ul{
  list-style-type: none;
  margin: 0;
  padding: 0;
}
.content_a .a_b li{
  display: inline;
  float: left;
  margin: 0 10px;
  font-size: 18px;
  font-weight: bold;
  border-bottom: 2px solid #EEEEEE;
  transition: all 0.2s ease;
}
.content_a .a_b li:hover{
  border-bottom: 2px solid #000000;
}
.content_a .a_b a{
  display: block;
  text-decoration: none;
  color: #000000;
}
.content_a .a_c{
  height: 80px;
  width: 0;
  float: left;
  display: none;
}
@media screen and (max-width: 640px){
  .content_a .a{
    margin: 0;
      -webkit-border-radius: 0;
    border-radius: 0;
  }
  .content_a .a_a{
    width: 80%;
  }
  .content_a .a_b{
    display: none;
    height: 0;
  }
  .content_a .a_c{
    display: block;
    width: 20%;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
}
.menu-icon{
  background: #D0D0D0;
  width: 70px;
  height: 40px;
  font-size: 17px;
  font-weight: bold;
  border: 1px solid #B0B0B0;
    -webkit-border-radius: 4px;
  border-radius: 4px;
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  transition: all 0.2s ease;
}
.menu-icon:hover{
  background: #EEEEEE;
  cursor: pointer;
}
.c_b{
  display: none;
}
.menu-open{
  display: block;
  background: #EEEEEE;
}
.content_a .c_b{
  margin-top: -20px;
  padding: 20px 0;
}
.content_a .c_b ul{
  list-style-type: none;
}
.content_a .c_b li{
  display: block;
  padding: 10px 15px;
  border-bottom: 1px solid #D0D0D0;
  margin-right: 40px;
}
.content_a .c_b a{
  font-size: 17px;
  font-weight: bold;
  color: #000000;
  text-decoration: none;
}

html{
	box-sizing: border-box;
}
*, *:before, *:after{
	box-sizing: inherit;
}
body{
	background: #1e436f;
	font-family: Calibri, Candara, Segoe, "Segoe UI", Optima, Arial, sans-serif;
	color: #37474f;
	font-size: 15px;
	margin: auto;
  padding: 0 10px;
}