nav {
  margin: 5px auto 0px ;

  position: relative;
  width: 300px;
  height: 50px;

  background-color: #FFFF8F;
  border-radius: 8px;
  font-size: 0;
  
  
}
nav a {
  line-height: 30px;
  height: 100%;
  font-size: 20px;
  display: inline-block;
  position: relative;
  z-index: 1;
  text-decoration: none;
  text-transform:inherit;
  text-align: center;
  color: #ff0000;
  cursor: pointer;
  padding: 3px;
  font-family:Verdana ;
  
  
}
nav:hover
{
    background: #1abc9c;
    color: #ffffff;
}

nav .animation {
  position: absolute;
  height: 100%;
  top: 0;
  z-index: 0;
  transition: all .5s ease 0s;
  border-radius: 8px;
}


a:nth-child(1) {
  width: 300px;
}
a:nth-child(2) {
  width: 300px;
}
a:nth-child(3) {
  width: 300px;
}
a:nth-child(4) {
  width: 300px;
}
a:nth-child(5) {
  width: 300px;
}
nav .start-home, a:nth-child(1):hover~.animation {
  width: 300px;
  left: 300;
  background-color: #1abc9c;
}
nav .start-about, a:nth-child(2):hover~.animation {
  width: 300px;
  left: 300px;
  background-color: #e74c3c;
}
nav .start-blog, a:nth-child(3):hover~.animation {
  width: 300px;
  left: 210px;
  background-color: #3498db;
}
nav .start-portefolio, a:nth-child(4):hover~.animation {
  width: 160px;
  left: 310px;
  background-color: #9b59b6;
}
nav .start-contact, a:nth-child(5):hover~.animation {
  width: 300px;
  left: 470px;
  background-color: #e67e22;
}




span {
    color: #2BD6B4;
}