html - Dropdown Menu Smooth Transition & Sizing Issue -

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so have 3 issues dropdown menu have in navbar site working on.

i dropdown appear in more smooth fashion, when add webkit-transitions classes in css, effect not take place.

my other issue dropdown items smaller parent; want dropdown items match width of .dropdown class item.

finally, when adjust menu mobile devices, dropdown class still displays blank space. surely there way make blank space disappear well. 

.navbar {    border-radius: 25px;    list-style-type: none;    margin: 0;    padding: 0;    overflow: hidden;    background-color: #66cc66;    text-align: center;  }    .navbar li {    display: inline-block;  }    .navbar li {    display: block;    color: white;    text-align: center;    padding: 14px 16px;    text-decoration: none;    transition: 0.2s;    z-index: 1;  }    .navbar li a:hover {    -webkit-transition-duration: 0.4s;    transition-duration: 0.4s;    background-color: #339966;  }    .dropdown {    position: relative;    text-align: center;  }    .dropdown-content {    display: none;    position: absolute;    background-color: #66cc66;    padding: 0;    margin: 0;    z-index: 1;    text-align: center;    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.15);  }    .dropdown-content {    display: block;    text-align: center;  }    .dropdown-content li {    display: block;    text-align: center;    padding: 0px;    margin: 0px;  }    .dropdown-content:hover {    display: block;  }    .dropdown:focus+.dropdown-content {    display: block;    position: absolute;  }    .dropdown:hover+.dropdown-content {    display: block;    position: absolute;    cursor: pointer;  }    ul.navbar li.icon {    display: none;  }    @media screen , (max-width:600px) {    .logo img {      max-width: 100%;    }    ul.navbar li {      display: none;    }    ul.navbar li.icon {      text-align: center;      display: block;    }    .contact {      text-align: center;      display: block;    }    .contact input {      min-width: 100%;    }  }    @media screen , (max-width: 600px) {    ul.navbar.responsive li {      position: relative;    }    ul.navbar.responsive li .icon {      position: absolute;    }    ul.navbar.responsive li {      float: none;      display: block;      text-align: center;    }    .dropdown {      display: none;      visibility: hidden;    }    .dropdown-content {      float: none;      display: block;      text-align: center;      position: relative;      box-shadow: none;    }  }
<div class="navpad">    <ul class="navbar" id="javamenu">      <li><a href="index.html">home</a></li>      <li><a href="about.html">about</a></li>      <li>        <a href="" class="dropdown">products ▾</a>        <ul class="dropdown-content">          <li><a href="#.html">drop 1</a></li>          <li><a href="#.html">drop 2</a></li>        </ul>      </li>      <li><a href="contact.html">contact</a></li>      <li class="icon">        <a href="javascript:void(0);" onclick="mobilefunction()">☰</a>      </li>    </ul>  </div>

the webkit transition trying add dropdown menu.

-webkit-transition: .25s ease; -moz-transition: .25s ease; -ms-transition: .25s ease; -o-transition: .25s ease; transition: .25s ease;





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