书写css代码。

.demo{width:200px; margin:60px auto 10px auto}

.wrap{margin:30px 0}

.wrap p{padding:10px 0}

.chk_1, .chk_2, .chk_3, .chk_4 { display: none; }

.chk_1 + label { background-color: #FFF; border: 1px solid #C1CACA; box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05), inset 0px -15px 10px -12px rgba(0, 0, 0, 0.05); padding: 9px; border-radius: 5px; display: inline-block; position: relative; margin-right: 30px; }

.chk_1 + label:active { box-shadow: 0 1px 2px rgba(0,0,0,0.05), inset 0px 1px 3px rgba(0,0,0,0.1); }

.chk_1:checked + label { background-color: #ECF2F7; border: 1px solid #92A1AC; box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05), inset 0px -15px 10px -12px rgba(0, 0, 0, 0.05), inset 15px 10px -12px rgba(255, 255, 255, 0.1); color: #243441; }

.chk_1:checked + label:after { content: '\2714'; position: absolute; top: 0px; left: 0px; color: #758794; width: 100%; text-align: center; font-size: 1.4em; padding: 1px 0 0 0; vertical-align: text-top; }

.chk_2 + label { background-color: #F37900; padding: 18px 20px 18px 23px; box-shadow: inset 0 50px 37px -30px rgba(255, 222, 197, 0.3), 0 0 13px rgba(0, 0, 0, 0.6); border-radius: 1000px; display: inline-block; position: relative; border-top: 1px solid #ECA14F; margin-right: 30px; color: #FFF; font-size: 1.7em; width: 113px; text-shadow: 0 1px 0 rgba(0, 0, 0, 0.2); border-bottom: 1px solid #552B09; }

.chk_2 + label:hover { border-top: 1px solid #FC8C1E; background: #FC8C1E; box-shadow: inset 0 -50px 37px -30px rgba(255, 222, 197, 0.07), 0 0 13px rgba(0, 0, 0, 0.6); }

.chk_2 + label:active { border-top: none; background: #FC8C1E; padding: 19px 20px 18px 23px; box-shadow: inset 0 3px 8px rgba(129, 69, 13, 0.3), inset 0 -50px 37px -30px rgba(255, 222, 197, 0.07), 0 0 13px rgba(0, 0, 0, 0.6); }

.chk_2 + label:after { content: ' '; border-radius: 100px; width: 32px; position: absolute; top: 12px; right: 12px; box-shadow: inset 0px 16px 40px rgba(0, 0, 0, 0.4); height: 32px; }

.chk_2 + label:before { content: ' '; border-radius: 100px; width: 20px; position: absolute; top: 18px; right: 18px; z-index: 999; box-shadow: inset 0px 16px 40px #FFF; height: 20px; display: none; }

.chk_2:checked + label:before { display: block; }

.chk_3 + label { background-color: #fafbfa; padding: 9px; border-radius: 50px; display: inline-block; position: relative; margin-right: 30px; -webkit-transition: all 0.1s ease-in; transition: all 0.1s ease-in; width: 40px; height: 15px; }

.chk_3 + label:after { content: ' '; position: absolute; top: 0; -webkit-transition: box-shadow 0.1s ease-in; transition: box-shadow 0.1s ease-in; left: 0; width: 100%; height: 100%; border-radius: 100px; box-shadow: inset 0 0 0 0 #eee, 0 0 1px rgba(0,0,0,0.4); }

.chk_3 + label:before { content: ' '; position: absolute; background: white; top: 1px; left: 1px; z-index: 999999; width: 31px; -webkit-transition: all 0.1s ease-in; transition: all 0.1s ease-in; height: 31px; border-radius: 100px; box-shadow: 0 3px 1px rgba(0,0,0,0.05), 0 0px 1px rgba(0,0,0,0.3); }

.chk_3:active + label:after { box-shadow: inset 0 0 0 20px #eee, 0 0 1px #eee; }

.chk_3:active + label:before { width: 37px; }

.chk_3:checked:active + label:before { width: 37px; left: 20px; }

.chk_3 + label:active { box-shadow: 0 1px 2px rgba(0,0,0,0.05), inset 0px 1px 3px rgba(0,0,0,0.1); }

.chk_3:checked + label:before { content: ' '; position: absolute; left: 26px; border-radius: 100px; }

.chk_3:checked + label:after { content: ' '; font-size: 1.5em; position: absolute; background: #4cda60; box-shadow: 0 0 1px #4cda60; }

.chk_4 + label { background-color: #FFF; padding: 11px 9px; border-radius: 7px; display: inline-block; position: relative; margin-right: 30px; background: #F7836D; width: 58px; height: 10px; box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.1), 0 0 10px rgba(245, 146, 146, 0.4); }

.chk_4 + label:before { content: ' '; position: absolute; background: #FFF; top: 0px; z-index: 99999; left: 0px; width: 24px; color: #FFF; height: 32px; border-radius: 7px; box-shadow: 0 0 1px rgba(0,0,0,0.6); }

.chk_4 + label:after { content: '关闭'; position: absolute; top: 7px; left: 37px; font-size: 1.2em; color: white; font-weight: bold; left: 8px; padding: 5px; top: 4px; border-radius: 100px; }

.chk_4:checked + label { background: #67A5DF; box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.1), 0 0 10px rgba(146, 196, 245, 0.4); }

.chk_4:checked + label:after { content: '开启'; left: 10px; }

.chk_4:checked + label:before { content: ' '; position: absolute; z-index: 99999; left: 52px; }

.chk_4 + label:after { left: 35px; }

#checkbox_d2 + label:after, #checkbox_d2 + label:before, #checkbox label { -webkit-transition: all 0.1s ease-in; transition: all 0.1s ease-in; }