之前为大家介绍了好几款导航菜单，今天再给大家带来一款css3实现的幽灵按钮式的导航菜单。导航界面非常好看。右侧是一个css3实现的动画消息图标。效果图如下：

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实现代码：

html代码：

  <header>
        <nav>
            <a>Home</a> <a>Words</a> <a>Activity</a> <a>Discussion</a> <a>Immersion</a>
        </nav>
        <button class="notif">
            <span class="icon"></span>
        </button>
    </header>

css3代码：

  * {
  margin: 0;    
  padding: 0;
}

body {
  background: #e9e9e9;
  overflow: hidden;
}

header {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
  background-color: #1CAFF6;
  background-color: rgba(32, 166, 231, 0.8);
  background-image: -webkit-gradient(linear, left top, left bottom, from(#20A8E9), to(rgba(30, 158, 220, 0.5)));
  background-image: -webkit-linear-gradient(top, #20A8E9, rgba(30, 158, 220, 0.5));
  background-image: linear-gradient(to bottom, #20A8E9, rgba(30, 158, 220, 0.5));
  padding: 0 50px;
}

main {
  background: white;
  height: 100vh;
  border-radius: 10px;
  margin: 30px 55px;
  background: 0 0 25px rgba(0, 0, 0, 0.04);
}

nav {
  -webkit-box-flex: 1;
  -webkit-flex: 1;
  -ms-flex: 1;
  flex: 1;
  font: 500 15px/20px "museo-sans-rounded", sans-serif;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  overflow: hidden;
  padding: 17px 0;
}

a {
  display: inline-block;
  padding: 10px 18px 8px;
  margin: 0 2px;
  border-radius: 100px;
  color: white;
  cursor: pointer;
  -webkit-animation: nav-in 0.35s cubic-bezier(0.2, 0.7, 0.2, 1.1) backwards;
  animation: nav-in 0.35s cubic-bezier(0.2, 0.7, 0.2, 1.1) backwards;
  -webkit-transition: background 0.35s;
  transition: background 0.35s;
}
a:hover {
  background: #1493D1;
  -webkit-transition: 0;
  transition: 0;
}
a:active {
  background: #107aad;
}
a:nth-child(1) {
  -webkit-animation-delay: 0.46667s;
  animation-delay: 0.46667s;
}
a:nth-child(2) {
  -webkit-animation-delay: 0.58333s;
  animation-delay: 0.58333s;
}
a:nth-child(3) {
  -webkit-animation-delay: 0.7s;
  animation-delay: 0.7s;
}
a:nth-child(4) {
  -webkit-animation-delay: 0.81667s;
  animation-delay: 0.81667s;
}
a:nth-child(5) {
  -webkit-animation-delay: 0.93333s;
  animation-delay: 0.93333s;
}

@-webkit-keyframes nav-in {
  from {
    -webkit-transform: translate3d(0px, 100px, 0);
    transform: translate3d(0px, 100px, 0);
  }
}

@keyframes nav-in {
  from {
    -webkit-transform: translate3d(0px, 100px, 0);
    transform: translate3d(0px, 100px, 0);
  }
}
.notif {
  display: inline-block;
  border-radius: 50%;
  background: #1392D0;
  padding: 7px 9px;
  width: 40px;
  height: 40px;
  border: 0;
  cursor: pointer;
  -webkit-transition: 0.35s;
  transition: 0.35s;
}
.notif:hover {
  background: #0e6d9c;
  -webkit-transition-duration: 0.0875s;
  transition-duration: 0.0875s;
  -webkit-transform: scale(1.1);
  -ms-transform: scale(1.1);
  transform: scale(1.1);
}
.notif:active, .notif:focus {
  -webkit-transition-duration: 0;
  transition-duration: 0;
  -webkit-transform: scale(1.15);
  -ms-transform: scale(1.15);
  transform: scale(1.15);
  background: #0b577c;
  outline: 0;
}
.notif .icon {
  display: inline-block;
  width: 22px;
  height: 26px;
  background-image: url("icon.png");
  -webkit-animation: notif 2s cubic-bezier(0.17, 0.67, 0.4, 1.17) infinite;
  animation: notif 2s cubic-bezier(0.17, 0.67, 0.4, 1.17) infinite;
  -webkit-background-size: 1000px 1000px;
  background-size: 1000px 1000px;
  background-position: -340px -40px;
}

@-webkit-keyframes notif {
  10%, 30% {
    -webkit-transform: rotate(-25deg);
    transform: rotate(-25deg);
  }
  20%, 40% {
    -webkit-transform: rotate(25deg);
    transform: rotate(25deg);
  }
  50%, 100% {
    -webkit-transform: none;
    transform: none;
  }
}

@keyframes notif {
  10%, 30% {
    -webkit-transform: rotate(-25deg);
    transform: rotate(-25deg);
  }
  20%, 40% {
    -webkit-transform: rotate(25deg);
    transform: rotate(25deg);
  }
  50%, 100% {
    -webkit-transform: none;
    transform: none;
  }
}

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