CSS常用效果

1.标题两边的小横杠

<div class="title">标题</div>
title {
  color: #e1767c;
  font-size: 0.3rem;
  position: relative;

  &:before,
  &:after {
    content: "";
    position: absolute;
    display: block;
    left: 50%;
    top: 50%;
    -webkit-transform: translate3d(-50%, -50%, 0);
    transform: translate3d(-50%, -50%, 0);
    border-top: 0.02rem solid #e1767c;
    width: 0.4rem;
  }
  &:before {
    margin-left: -1.2rem;
  }
  &:after {
    margin-left: 1.2rem;
  }
}

2.鼠标手型(cursor属性)

a[href],
input[type="submit"],
input[type="image"],
input[type="button"],
label[for],
select,
button {
  cursor: pointer;
}

3.小三角

.triangle {
  /* 基础样式 */
  border: solid 10px transparent;
}
/*下*/
.triangle.bottom {
  border-top-color: green;
}
/*上*/
.triangle.top {
  border-bottom-color: green;
}
/*左*/
.triangle.top {
  border-right-color: green;
}
/*右*/
.triangle.top {
  border-left-color: green;
}

3.flutter调试模式上面的小便签（顶角贴纸效果）

<div class="wrap">
  <div class="ribbon">
    <a href="#">Fork me on GitHub</a>
  </div>
</div>

/* 外层容器几本设置  */
.wrap {
  width: 160px;
  height: 160px;
  overflow: hidden;
  position: relative;
  background-color: #f3f3f3;
}

.ribbon {
  background-color: #a00;
  overflow: hidden;
  white-space: nowrap;
  position: absolute;
  /* shadom */
  -webkit-box-shadow: 0 0 10px #888;
  -moz-box-shadow: 0 0 10px #888;
  box-shadow: 0 0 10px #888;
  /* rotate */
  -webkit-transform: rotate(-45deg);
  -moz-transform: rotate(-45deg);
  -ms-transform: rotate(-45deg);
  -o-transform: rotate(-45deg);
  transform: rotate(-45deg);
  /* position */
  left: -50px;
  top: 40px;
}

.ribbon a {
  border: 1px solid #faa;
  color: #fff;
  display: block;
  font: bold 81.25% "Helvetica Neue", Helvetica, Arial, sans-serif;
  margin: 1px 0;
  padding: 10px 50px;
  text-align: center;
  text-decoration: none;
  /* shadow */
  text-shadow: 0 0 5px #444;
}

4.用 border 属性绘制元素
border 除了作为简单的绘制边框以外，还可以绘制三角形，梯形，星形等任意的多边形，以下为绘制的两个三角形和梯形

<div class="triangle1"></div>
<div class="triangle2"></div>
<div class="trapezoid"></div>
.triangle1 {
  /*锐角三角形*/
  width: 0;
  height: 0;
  border-top: 50px solid transparent;
  border-bottom: 100px solid #249ff1;
  border-left: 30px solid transparent;
  border-right: 100px solid transparent;
}
.triangle2 {
  /*直角三角形*/
  width: 0;
  height: 0;
  border-top: 80px solid transparent;
  border-bottom: 80px solid #ff5b01;
  border-left: 50px solid #ff5b01;
  border-right: 50px solid transparent;
}
.trapezoid {
  /*梯形*/
  width: 0;
  height: 0;
  border-top: none;
  border-right: 80px solid transparent;
  border-bottom: 60px solid #13dbed;
  border-left: 80px solid #13dbed;
}

5.用 border-radius 绘制元素,border-radius主要用于绘制圆点、圆形、椭圆、圆角矩形等形状，以下为简单绘制的两个图形。

<div class="circle"></div>
<div class="ellipse"><div></div></div>
.circle,
.ellipse {
  width: 100px;
  height: 100px;
  background: #249ff1;
  border-radius: 50%;
}
.ellipse {
  width: 150px;
  background: #ff9e01;
}

6.使用 CSS 渐变来绘制图标

<div class="gradient"></div>
.gradient {
  position: relative;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background-color: silver;
  background-image: linear-gradient(335deg, #b00 23px, transparent 23px),
    linear-gradient(155deg, #d00 23px, transparent 23px), linear-gradient(
      335deg,
      #b00 23px,
      transparent 23px
    ), linear-gradient(155deg, #d00 23px, transparent 23px);
  background-size: 58px 58px;
  background-position: 0px 2px, 4px 35px, 29px 31px, 34px 6px;
}

7.杯子

.cup {
  display: inline-block;
  width: 0.9em;
  height: 0.4em;
  border: 0.25em solid;
  border-bottom: 1.1em solid;
  border-radius: 0 0 0.25em 0.25em;
}
cup:before {
  position: absolute;
  right: -0.6em;
  top: 0;
  width: 0.3em;
  height: 0.8em;
  border: 0.25em solid;
  border-left: none;
  border-radius: 0 0.25em 0.25em 0;
  content: "";
}

8.心型

.heart {
  display: inline-block;
  margin-top: 1.5em;
  width: 50px;
  height: 50px;
  background: green;
}
.heart:before,
.heart:after {
  position: absolute;
  width: 1em;
  height: 1.6em;
  background: #000;
  border-radius: 50% 50% 0 0;
  content: "";
  bottom: 0;
}
.heart:before {
  -webkit-transform: rotate(45deg);
  -webkit-transform-origin: 100% 100%;
  right: 0;
  background: red;
  opacity: 0.5;
  z-index: 5;
}
.:after {
  -webkit-transform: rotate(-45deg);
  -webkit-transform-origin: 0 100%;
  left: 0;
  opacity: 0.8;
}

9.相机

.camera {
  display: inline-block;
  border-style: solid;
  border-width: 0.65em 0.9em;
  border-radius: 0.1em;
}
.camera:before {
  position: absolute;
  top: -0.3em;
  left: -0.3em;
  width: 0.4em;
  height: 0.4em;
  border-radius: 50%;
  border: 0.1em solid #fff;
  box-shadow: 0 0 0 0.08em, 0 0 0 0.16em #fff;
  content: "";
}
.camera:after {
  position: absolute;
  top: -0.5em;
  left: 0.5em;
  width: 0.2em;
  border-top: 0.125em solid #fff;
  content: "";
}

10.月亮

.moon {
  display: inline-block;
  height: 1.5em;
  width: 1.5em;
  box-shadow: inset -0.4em 0 0;
  border-radius: 2em;
  transform: rotate(20deg);
}

11.月亮

.moon {
  display: inline-block;
  height: 1.5em;
  width: 1.5em;
  box-shadow: inset -0.4em 0 0;
  border-radius: 2em;
  transform: rotate(20deg);
}

12.阴影效果

.shadow-text-xs {
  text-shadow: 4px 3px 0 #1d9d74, 9px 8px 0 rgba(0, 0, 0, 0.15);
} /*智能兼容ie10以上 暂不考虑*/

.shadow-xs {
  -ms-filter: "progid:DXImageTransform.Microsoft.Shadow(Strength=1, Direction=100, Color='#cccccc')"; /* For IE 8 */
  filter: progid:DXImageTransform.Microsoft.Shadow(Strength=1, Direction=100, Color='#cccccc'); /* For IE 5.5 - 7 */
  -moz-box-shadow: 1px 1px 2px #cccccc; /* for firefox */
  -webkit-box-shadow: 1px 1px 2px #cccccc; /* for safari or chrome */
  box-shadow: 1px 1px 2px #cccccc; /* for opera or ie9 */
}
.shadow-sm {
  -ms-filter: "progid:DXImageTransform.Microsoft.Shadow(Strength=2, Direction=120, Color='#cccccc')"; /* For IE 8 */
  filter: progid:DXImageTransform.Microsoft.Shadow(Strength=2, Direction=120, Color='#cccccc'); /* For IE 5.5 - 7 */
  -moz-box-shadow: 2px 2px 3px #cccccc; /* for firefox */
  -webkit-box-shadow: 2px 2px 3px #cccccc; /* for safari or chrome */
  box-shadow: 2px 2px 3px #cccccc; /* for opera or ie9 */
}
.shadow-md {
  -ms-filter: "progid:DXImageTransform.Microsoft.Shadow(Strength=3, Direction=135, Color='#cccccc')"; /* For IE 8 */
  filter: progid:DXImageTransform.Microsoft.Shadow(Strength=3, Direction=135, Color='#cccccc'); /* For IE 5.5 - 7 */
  -moz-box-shadow: 3px 3px 5px #cccccc; /* for firefox */
  -webkit-box-shadow: 3px 3px 5px #cccccc; /* for safari or chrome */
  box-shadow: 3px 3px 5px #cccccc; /* for opera or ie9 */
}
.shadow-lg {
  -ms-filter: "progid:DXImageTransform.Microsoft.Shadow(Strength=5, Direction=150, Color='#cccccc')"; /* For IE 8 */
  filter: progid:DXImageTransform.Microsoft.Shadow(Strength=5, Direction=150, Color='#cccccc'); /* For IE 5.5 - 7 */
  -moz-box-shadow: 5px 5px 8px #cccccc; /* for firefox */
  -webkit-box-shadow: 5px 5px 8px #cccccc; /* for safari or chrome */
  box-shadow: 5px 5px 8px #cccccc; /* for opera or ie9 */
}