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CSS

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HTML 

              
                <body>

    <div class="wrapper">
        <div class="button" onclick="document.body.classList.add('active')">
            <span class="button-text">Press</span>
            <div class="button-backgrounds">
                <div class="button-circle button-circle1"></div>
                <div class="button-circle button-circle2"></div>
                <div class="button-circle button-circle3"></div>
                <div class="button-circle button-circle4"></div>
            </div>
        </div>
    </div>

    <div class="wrapper">
        <div class="popup">
            <div class="popup-inside">
                <div class="backgrounds">
                    <div class="background"></div>
                    <div class="background background2"></div>
                    <div class="background background3"></div>
                    <div class="background background4"></div>
                    <div class="background background5"></div>
                    <div class="background background6"></div>
                </div>
            </div>
            <div class="content">
                <div class="content-wrapper">
                    <h1>well done</h1>
                    <p>Do you like it?</p>
                    <p class="try-again" onclick="document.body.classList.remove('active')">Yes! I will try again</p>
                </div>
            </div>
        </div>
    </div>

</body>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Raleway');

:root, button{
    font-family: 'Raleway', serif;
}

*{
    box-sizing: border-box;
}

.color{
    background: linear-gradient(to right, #e1e0ff, #d7fadd);
}

body{
    background: #191919;
    background: white;
    user-select: none;
    letter-spacing: 3px;
    color: #b9b9b9;
}

h1{
    padding-bottom: 40px;
    text-transform: uppercase;
    letter-spacing: 3px;
    font-size: 16px;
}

p{
    padding-bottom: 15px;
}

p:last-of-type{
    padding-bottom: 0;
}

.try-again{
    cursor: pointer;
    position: relative;
    font-size: 16px;
}

.try-again:after{
    content: '';
    position: absolute;
    left: 15px;
    right: 15px;
    height: 1px;
    top: 100%;
    background: #ebebeb;
    margin-top: 8px;
    transition: all 0.3s ease;
}

.try-again:hover:after{
    left: 40%;
    right: 40%;
}

.wrapper{
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.button{
    cursor: pointer;
    position: relative;
    z-index: 2;
    -webkit-appearance: none;
    background: none;
    outline: none;
    border: none;
    text-transform: uppercase;
    letter-spacing: 3px;
    border-radius: 2px;
    transition: all 0.5s ease;
    font-weight: 600;
    font-size: 14px;
    height: 60px;
    width: 110px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(0,0,0,0.06);
    border-radius: 0px;
    box-shadow: 0 0 0 white, 0 0 0 white;
}

.button-text{
    display: inline-block;
    position: relative;
    z-index: 2;
    background: linear-gradient(to right, #504bff, #4cfa63);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.button-circle{
    position: absolute;
    left: 0;
    top: 0;
    height: 6px;
    width: 6px;
    border-radius: 50%;
    box-shadow: 0 0 10px #504bff, 0 0 20px #504bff, 0 0 30px #504bff;
    transition: all 0.5s ease;
}

.button-circle2{
    top: auto;
    bottom: 0;
}

.button-circle3{
    left: auto;
    right: 0;
    box-shadow: 0 0 10px #4cfa63, 0 0 20px #4cfa63, 0 0 30px #4cfa63;
}

.button-circle4{
    left: auto;
    top: auto;
    bottom: 0;
    right: 0;
    box-shadow: 0 0 10px #4cfa63, 0 0 20px #4cfa63, 0 0 30px #4cfa63;
}

.button:hover{
    box-shadow: -15px 0 70px -15px #504bff, 15px 0 70px -15px #4cfa63;
}

.button:hover .button-circle1{
    transform: translate(-15px, -15px) scale(0);
}

.button:hover .button-circle2{
    transform: translate(-15px, 15px) scale(0);
}

.button:hover .button-circle3{
    transform: translate(15px, -15px) scale(0);
}

.button:hover .button-circle4{
    transform: translate(15px, 15px) scale(0);
}

.button:hover .button-circle{
    box-shadow: none;
}

.popup{
    opacity: 0;
    visibility: hidden;
    height: 400px;
    width: 400px;
    flex-shrink: 0;
    border-radius: 3px;
    position: relative;
    z-index: 3;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease
}

.popup-inside{
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 100%;
    overflow: hidden;
    border-radius: 50%;
    box-shadow: 0 0 0 black;
    transition:
            box-shadow 0.5s ease 0.7s,
            border-radius 0.35s ease 0.7s;
}

.backgrounds{
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 100%;
    overflow: hidden;
}

.background{
    --offset: 0;
    position: absolute;
    left: var(--offset);
    right: var(--offset);
    bottom: var(--offset);
    top: var(--offset);
    background: linear-gradient(to right, #504bff, #4cfa63);
    transform: scale(0);
    transition: all 0.5s ease 0s;
    border-radius: 50%;
}

.background2{
    --offset: 10%;
    position: absolute;
    left: var(--offset);
    right: var(--offset);
    bottom: var(--offset);
    top: var(--offset);
    background: linear-gradient(to right, #6665ff, #69fa7f);
    transform: scale(0);
    transition: all 0.5s ease 0.1s;
}

.background3{
    --offset: 20%;
    position: absolute;
    left: var(--offset);
    right: var(--offset);
    bottom: var(--offset);
    top: var(--offset);
    background: linear-gradient(to right, #8583ff, #85fa99);
    z-index: 2;
    transition: all 0.5s ease 0.2s;
}

.background4{
    --offset: 30%;
    position: absolute;
    left: var(--offset);
    right: var(--offset);
    bottom: var(--offset);
    top: var(--offset);
    background: linear-gradient(to right, #aaaaff, #a7fab7);
    z-index: 3;
    transition: all 0.5s ease 0.3s;
}

.background5{
    --offset: 40%;
    position: absolute;
    left: var(--offset);
    right: var(--offset);
    bottom: var(--offset);
    top: var(--offset);
    background: linear-gradient(to right, #c9c8ff, #c3fad1);
    z-index: 4;
    transition: all 0.5s ease 0.4s;
}

.background6{
    --offset: 40%;
    position: absolute;
    left: var(--offset);
    right: var(--offset);
    bottom: var(--offset);
    top: var(--offset);
    background: white;
    z-index: 5;
    transition: all 0.8s ease 0.4s;
}

.content{
    --offset: 0;
    position: absolute;
    left: var(--offset);
    right: var(--offset);
    bottom: var(--offset);
    top: var(--offset);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: all 0.35s ease 0.75s;
    z-index: 10;
}

.content-wrapper{
    text-align: center;
}

body.active .content{
    opacity: 1;
    transform: none;
}

body.active .popup{
    opacity: 1;
    visibility: visible;
}

body.active .popup-inside{
    border-radius: 0;
    box-shadow: -50px 0 200px -50px #504bff, 50px 0 200px -50px #4cfa63;
}

body.active .background{
    transform: scale(1);
}

body.active .background6{
    transform: scale(8);
}
!

JS
!
999px

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