<main>
    <h1><span id="app-name">Toggle buttons</span></h1>
    <section>
        <div class="toggle-btn" id="_1st-toggle-btn">
            <input type="checkbox">
            <span></span>
        </div>
        
        <div class="toggle-btn" id="_2nd-toggle-btn">
            <input type="checkbox">
            <span></span>
        </div>

        <div class="toggle-btn" id="_3rd-toggle-btn">
            <input type="checkbox">
            <span></span>
        </div>
    </section>
</main>
body {
    margin: 0px;
    background-color: #f8f8f8;
}
h1 {
    font-family: Segoe UI;
    text-align: center;
    line-height: 42px;
    padding-bottom: 23px;
    margin: 10px 0px;
    border-bottom: 1px solid #dadada;
}
#app-name {
    color: #f19000;
}
section {
    width: 250px;
    margin: 100px auto;
    padding: 60px;
    background-color: #fff;
    box-shadow: 0px 5px 35px #d7d7d7;
    border-radius: 35px;
}
.toggle-btn {
    position: relative;
    width: 145px;
    height: 74px;
    margin: 0 auto;
    border-radius: 40px;
}
input[type="checkbox"] {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0px;
    left: 0px;
    right: 0px;
    bottom: 0px;
    margin: 0px;
    cursor: pointer;
    opacity: 0;
    z-index: 2;
}

/* First toggle btn */

#_1st-toggle-btn span {
    position: absolute;
    top: 0px;
    right: 0px;
    bottom: 0px;
    left: 0px;
    overflow: hidden;
    opacity: 1;
    background-color: #fff;
    box-shadow: 0px 2px 25px #d9d9d9;
    border-radius: 40px;
    transition: 0.2s ease background-color, 0.2s ease opacity;
}
#_1st-toggle-btn span:before, #_1st-toggle-btn span:after {
    content: '';
    position: absolute;
    top: 8px;
    width: 58px;
    height: 58px;
    border-radius: 50%;
    transition: 0.5s ease transform, 0.2s ease background-color;
}
#_1st-toggle-btn span:before {
    background-color: #fff;
    transform: translate(-58px, 0px);
    z-index: 1;
}
#_1st-toggle-btn span:after {
    background-color: #000;
    transform: translate(8px, 0px);
    z-index: 0;
}
#_1st-toggle-btn input[type="checkbox"]:checked+span {
    background-color: #000;
}
#_1st-toggle-btn input[type="checkbox"]:active+span {
    opacity: 0.5;
}
#_1st-toggle-btn input[type="checkbox"]:checked+span:before {
    background-color: #000;
    transform: translate(56px, -19px);
}
#_1st-toggle-btn input[type="checkbox"]:checked+span:after {
    background-color: #fff;
    transform: translate(79px, 0px);
}

/* First toggle btn completed */

/* Second toggle btn */

#_2nd-toggle-btn {
    margin: 60px auto 76px auto;
}
#_2nd-toggle-btn span {
    position: absolute;
    top: 0px;
    right: 0px;
    bottom: 0px;
    left: 0px;
    border: 8px solid #b3b3b3;
    border-color: #b3b3b3;
    overflow: hidden;
    background-color: #fff;
    border-radius: 40px;
    transition: 0.8s ease border-color;
}
#_2nd-toggle-btn span:before {
    content: '';
    position: absolute;
    top: -8px;
    width: 58px;
    height: 58px;
    border-width: 8px;
    border-style: solid;
    border-color: #b3b3b3;
    margin-left: 0px;
    border-radius: 50%;
    transform: translate(-8px, 0px);
    transition: 0.4s ease border-radius, 0.4s ease transform, 0.6s ease width, 0.6s ease margin-left, 0.8s ease border-color;
}
#_2nd-toggle-btn input[type="checkbox"]:active+span:before {
    width: 80px;
    border-radius: 40px;
}
#_2nd-toggle-btn input[type="checkbox"]:checked:active+span:before {
    margin-left: -22px;
}
#_2nd-toggle-btn input[type="checkbox"]:checked+span {
    border-color: #000;
}
#_2nd-toggle-btn input[type="checkbox"]:checked+span:before {
    border-color: #000;
    transform: translate(63px, 0px);
}

/* Second toggle btn completed */

/* Third toggle btn */

#_3rd-toggle-btn span {
    display: block;
    width: 145px;
    height: 38px;
    background-color: #c7c7c7;
    border-radius: 20px;
    transition: 0.5s ease background-color;
}
#_3rd-toggle-btn span:before {
    content: '';
    position: absolute;
    top: -16px;
    width: 70px;
    height: 70px;
    background-color: #fff;
    border-radius: 50%;
    box-shadow: 2px 6px 25px #d7d7d7;
    transform: translate(0px, 0px);
    transition: 0.6s ease transform, 0.6s box-shadow;
}
#_3rd-toggle-btn span:after {
    content: '';
    position: absolute;
    top: 50%;
    right: 0px;
    left: 35px;
    width: 0px;
    height: 24px;
    margin-top: -36px;
    margin-left: -6px;
    border: 6px solid #000;
    border-radius: 20px;
    transform: translate(0px, 0px);
    transition: 0.4s ease width, 0.4s ease border-radius, 0.62s ease transform;
}
#_3rd-toggle-btn input[type="checkbox"]:checked+span:before {
    box-shadow: 7px 6px 25px #e6e6e6;
    transform: translate(75px, 0px);
}
#_3rd-toggle-btn input[type="checkbox"]:checked+span:after {
    width: 24px;
    border-radius: 50%;
    transform: translate(64px, 0px);
}
#_3rd-toggle-btn input[type="checkbox"]:checked+span {
    background-color: #000;
}

/* Third toggle btn completed */
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