Οριζόντιο μενού

<style>form#GRss{
      padding:0 0 0 10px;
      margin:0 auto;
      width:95%;
      height:45px;
      background:#000;
      font-family: arial, sans-serif;
      background:#000;
      background-image: -moz-linear-gradient(-90deg, rgba(255, 255, 255, 0.7), rgba(255, 255, 255, 0));
      background-image: -webkit-linear-gradient(-90deg, rgba(255, 255, 255, 0.5), rgba(255, 255, 255, 0));
      background-image: -o-linear-gradient(-90deg, rgba(255, 255, 255, 0.5), rgba(255, 255, 255, 0));
      background-image: linear-gradient(-90deg, rgba(255, 255, 255, 0.5), rgba(255, 255, 255, 0));
      border-radius:8px;
      box-shadow:0 15px 10px -8px rgba(0,0,0,0.4);
}
form#GRss input{
      width:80px;
      height:20px;
      float:right;
      margin:10px 12px 0 0;
      border:0;
      background:#aaa url(https://lh6.googleusercontent.com/-oF2gBVOjZhQ/UhXEtzmJXsI/AAAAAAAAFgo/RaXRS3zaEMs/h120/lefta4klik-search.png) no-repeat 3px center;
      border-radius:10px;
      padding-left:20px;
      outline:none;
      -webkit-transition: 0.5s;
      -moz-transition: 0.5s;
      -o-transition: 0.5s;
      transition: 0.5s;
}
form#GRss input:focus {
      width:200px;
      background-color:#fff;
}
form a{
      display:block;
      float:left;
      height:34px;
      width:100px;
      text-align:center;
      color:#fff;
      line-height:35px;
      text-decoration:none;
      text-shadow:0 1px 5px rgba(0, 0, 0, 0.5);
      margin:5px 3px 0;
      background:#900;
      border-radius:6px 6px 4px 4px;
      -moz-box-shadow:inset 0px 3px 3px rgba(0, 0, 0, 0.4);
      -webkit-box-shadow:inset 0px 3px 3px rgba(0, 0, 0, 0.4);
      -o-box-shadow:inset 0px 3px 3px rgba(0, 0, 0, 0.4);
      box-shadow:inset 0px 3px 3px rgba(0, 0, 0, 0.4);
      -webkit-transition: 0.5s;
      -moz-transition: 0.5s;
      -o-transition: 0.5s;
      transition: 0.5s;
}
form#GRss input:focus ~ a {width:80px;}
form#GRss a:hover{background:#333;
      background:#09c;
      border-radius:8px 8px 0 0;
      -moz-box-shadow:inset 0px 3px 3px rgba(0, 0, 0, 0.4);
      -webkit-box-shadow:inset 0px 3px 3px rgba(0, 0, 0, 0.4);
      -o-box-shadow:inset 0px 3px 3px rgba(0, 0, 0, 0.4);
      box-shadow:inset 0px 3px 3px rgba(0, 0, 0, 0.4);
      text-decoration:none;
}
</style>  <form action="https://lefta4klik.blogspot.gr/search" id="GRss" method="get">
<input name="q" type="text" value="Search..." />
 <a href="#">First</a>
 <a href="#">one</a>
 <a href="#">two</a>
 <a href="#">three</a>
 <a href="#">four</a>
 <a href="#">five</a>
</form>