純CSS特效在網頁設計中經常使用，可以為網頁增添一些引人注目的效果和交互效果。這里為大家分享一些簡單的純CSS特效代碼。

/* 文字閃爍效果 */
@keyframes blink {
0% {
opacity: 1;
}
50% {
opacity: .5;
}
100% {
opacity: 1;
}
}
.blink {
animation: blink 1s infinite;
}
/* 圖片翻轉效果 */
.flip-card {
position: relative;
width: 200px;
height: 200px;
margin: 20px 0;
transform-style: preserve-3d;
transition: transform .5s;
}
.flip-card:hover {
transform: rotateY(180deg);
}
.flip-card-inner {
position: relative;
width: 100%;
height: 100%;
text-align: center;
transition: transform .5s;
transform-style: preserve-3d;
}
.flip-card:hover .flip-card-inner {
transform: rotateY(180deg);
}
.flip-card-front, .flip-card-back {
position: absolute;
width: 100%;
height: 100%;
backface-visibility: hidden;
}
.flip-card-front {
background-color: #fff;
}
.flip-card-back {
transform: rotateY(180deg);
background-color: #000;
color: #fff;
}
/* 按鈕懸浮效果 */
.btn {
display: inline-block;
padding: 10px 30px;
background-color: #fff;
border: solid 1px #000;
font-size: 20px;
transition: all .3s;
}
.btn:hover {
background-color: #000;
color: #fff;
}
/* 背景圖像放大效果 */
.background {
background-image: url('xxx.jpg');
background-size: cover;
background-position: center;
height: 400px;
position: relative;
}
.background:before {
content: '';
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
background-color: rgba(0, 0, 0, .5);
opacity: 0;
transition: opacity .3s;
}
.background:hover:before {
opacity: 1;
}

以上是一些簡單的純CSS特效代碼，可以根據需要進行調整和修改，實現更加個性化的效果。