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<section class="container">
	<div class="box effect1">
		<h3>效果 1</h3>
	</div>
	<div class="box effect2">
		<h3>效果 2</h3>
	</div>
	<div class="box effect3">
		<h3>效果 3</h3>
	</div>
	<div class="box effect4">
		<h3>效果 4</h3>
	</div>
	<div class="box effect5">
		<h3>效果 5</h3>
	</div>
	<div class="box effect6">
		<h3>效果 6</h3>
	</div>
	<div class="box effect7">
		<h3>效果 7</h3>
	</div>
	<div class="box effect8">
		<h3>效果 8</h3>
	</div>
</section>
.box {
    width: 70%;
    height: 200px;
    background: #FFF;
    margin: 40px auto;
}

.box h3 {
    text-align: center;
    position: relative;
    top: 80px;
}

.effect1 {
    -webkit-box-shadow: 0 10px 6px -6px #777;
    -moz-box-shadow: 0 10px 6px -6px #777;
    box-shadow: 0 10px 6px -6px #777;
}

.effect2 {
    position: relative;
}

.effect2::before,
.effect2::after {
    z-index: -1;
    position: absolute;
    content: "";
    bottom: 15px;
    left: 10px;
    width: 50%;
    top: 80%;
    max-width: 300px;
    background: #777;
    -webkit-box-shadow: 0 15px 10px #777;
    -moz-box-shadow: 0 15px 10px #777;
    box-shadow: 0 15px 10px #777;
    -webkit-transform: rotate(-3deg);
    -moz-transform: rotate(-3deg);
    -o-transform: rotate(-3deg);
    -ms-transform: rotate(-3deg);
    transform: rotate(-3deg);
}

.effect2::after {
    -webkit-transform: rotate(3deg);
    -moz-transform: rotate(3deg);
    -o-transform: rotate(3deg);
    -ms-transform: rotate(3deg);
    transform: rotate(3deg);
    right: 10px;
    left: auto;
}

.effect3 {
    position: relative;
}

.effect3::before {
    z-index: -1;
    position: absolute;
    content: "";
    bottom: 15px;
    left: 10px;
    width: 50%;
    top: 80%;
    max-width: 300px;
    background: #777;
    -webkit-box-shadow: 0 15px 10px #777;
    -moz-box-shadow: 0 15px 10px #777;
    box-shadow: 0 15px 10px #777;
    -webkit-transform: rotate(-3deg);
    -moz-transform: rotate(-3deg);
    -o-transform: rotate(-3deg);
    -ms-transform: rotate(-3deg);
    transform: rotate(-3deg);
}

.effect4 {
    position: relative;
}

.effect4::after {
    z-index: -1;
    position: absolute;
    content: "";
    bottom: 15px;
    right: 10px;
    width: 50%;
    top: 80%;
    max-width: 300px;
    background: #777;
    -webkit-box-shadow: 0 15px 10px #777;
    -moz-box-shadow: 0 15px 10px #777;
    box-shadow: 0 15px 10px #777;
    -webkit-transform: rotate(3deg);
    -moz-transform: rotate(3deg);
    -o-transform: rotate(3deg);
    -ms-transform: rotate(3deg);
    transform: rotate(3deg);
}

.effect5 {
    position: relative;
}

.effect5::before,
.effect5::after {
    z-index: -1;
    position: absolute;
    content: "";
    bottom: 25px;
    left: 10px;
    width: 50%;
    top: 80%;
    max-width: 300px;
    background: #777;
    -webkit-box-shadow: 0 35px 20px #777;
    -moz-box-shadow: 0 35px 20px #777;
    box-shadow: 0 35px 20px #777;
    -webkit-transform: rotate(-8deg);
    -moz-transform: rotate(-8deg);
    -o-transform: rotate(-8deg);
    -ms-transform: rotate(-8deg);
    transform: rotate(-8deg);
}

.effect5::after {
    -webkit-transform: rotate(8deg);
    -moz-transform: rotate(8deg);
    -o-transform: rotate(8deg);
    -ms-transform: rotate(8deg);
    transform: rotate(8deg);
    right: 10px;
    left: auto;
}

.effect6 {
    position: relative;
    -webkit-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
    -moz-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
}

.effect6::before,
.effect6::after {
    content: "";
    position: absolute;
    z-index: -1;
    -webkit-box-shadow: 0 0 20px rgba(0, 0, 0, 0.8);
    -moz-box-shadow: 0 0 20px rgba(0, 0, 0, 0.8);
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.8);
    top: 50%;
    bottom: 0;
    left: 10px;
    right: 10px;
    -moz-border-radius: 100px / 10px;
    border-radius: 100px / 10px;
}

.effect6::after {
    right: 10px;
    left: auto;
    -webkit-transform: skew(8deg) rotate(3deg);
    -moz-transform: skew(8deg) rotate(3deg);
    -ms-transform: skew(8deg) rotate(3deg);
    -o-transform: skew(8deg) rotate(3deg);
    transform: skew(8deg) rotate(3deg);
}

.effect7 {
    position: relative;
    -webkit-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
    -moz-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
}

.effect7::before,
.effect7::after {
    content: "";
    position: absolute;
    z-index: -1;
    -webkit-box-shadow: 0 0 20px rgba(0, 0, 0, 0.8);
    -moz-box-shadow: 0 0 20px rgba(0, 0, 0, 0.8);
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.8);
    top: 0;
    bottom: 0;
    left: 10px;
    right: 10px;
    -moz-border-radius: 100px / 10px;
    border-radius: 100px / 10px;
}

.effect7::after {
    right: 10px;
    left: auto;
    -webkit-transform: skew(8deg) rotate(3deg);
    -moz-transform: skew(8deg) rotate(3deg);
    -ms-transform: skew(8deg) rotate(3deg);
    -o-transform: skew(8deg) rotate(3deg);
    transform: skew(8deg) rotate(3deg);
}

.effect8 {
    position: relative;
    -webkit-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
    -moz-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
}

.effect8::before,
.effect8::after {
    content: "";
    position: absolute;
    z-index: -1;
    -webkit-box-shadow: 0 0 20px rgba(0, 0, 0, 0.8);
    -moz-box-shadow: 0 0 20px rgba(0, 0, 0, 0.8);
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.8);
    top: 10px;
    bottom: 10px;
    left: 0;
    right: 0;
    -moz-border-radius: 100px / 10px;
    border-radius: 100px / 10px;
}

.effect8::after {
    right: 10px;
    left: auto;
    -webkit-transform: skew(8deg) rotate(3deg);
    -moz-transform: skew(8deg) rotate(3deg);
    -ms-transform: skew(8deg) rotate(3deg);
    -o-transform: skew(8deg) rotate(3deg);
    transform: skew(8deg) rotate(3deg);
}