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HTML

              
                        <div class="container">
            <a href="#" class="button reflection">Click me</a>
        </div>

        <div class="container">
            <a href="#" class="button rattle">See me!</a>
        </div>

        <div class="container">
            <a href="#" class="button pastel"><span>Color shifter</span></a>
        </div>

        <div class="container">

                <div class="expand">

                    <div class="hide before">
                        <input type="text" placeholder="Name"/>
                        <input type="password" placeholder="Passw"/>
                    </div>
                    <a href="#" class="button action">Login</a>
                    <div class="hide after">
                        <a href="#" class="button cancel">Cancel</a>
                    </div>
                </div>

        </div>
              
            
!

CSS

              
                $blue: #5197d4;
$darkgreen: #6d902f;
$lightgreen: #a4d74a;
$pastel1: #ffc987;
$pastel2: #fdafb0;
$pastel3: #bdf2ff;
$greenish: #00B75E;
$fontsize: 30px;

@import url('https://fonts.googleapis.com/css?family=Overpass:400,600,700,900');
body {
    padding: 0;
    margin: 0;
}
.container {
    display: flex;
    align-items: center;
    min-height: 25vh;
    width: 100vw;
}
.button {
    display: inline-block;
    margin: 1rem auto;
    border: none;
    padding: .65em 1em .5em;
    border-radius: .2em;

    text-decoration: none;
    font-size: $fontsize;
    font-family: "Overpass", sans-serif;
    font-weight: 600;
    letter-spacing: .05em;
    line-height: 1em;
}
.rattle {
    color: lighten($blue,50%);
    background: $blue;
    text-shadow: 0 .05em 0 darken($blue,20%);
    box-shadow: 0 .1em .2em transparentize(darken($blue, 30%), 0.5);

    animation: rattle 5s infinite;
}

.reflection {
    background: linear-gradient(to bottom, $lightgreen 0%, $darkgreen 100%);
    text-shadow: 0 1px 0 rgba(0,0,0,0.3);
    color: #fff;
    position: relative;
    box-shadow: 0 .1em .3em rgba(69,104,7,.75);

    animation: turny 5s ease-in infinite;
    &:before {
        content:'';
        display: block;
        position: absolute;
        top: 0;
        bottom: 0;
        left: 0;
        right: 0;
        background-image: linear-gradient(135deg,
            rgba(255,255,255,0) 0%,
            rgba(255,255,255,0) 45%,
            rgba(255,255,255,0.2) 55%,
            rgba(255,255,255,0) 55%,
            rgba(255,255,255,0) 100%);
        background-size: 400% 400%;
        background-position: right bottom;
        background-repeat: no-repeat;
        animation: reflection 5s ease-in infinite;
    }
}
.pastel {
    color: #fff;
    background-image: radial-gradient(ellipse at center, $pastel1 0%,$pastel2 47%,$pastel3 100%);
    background-size: $fontsize*20 $fontsize*20;
    background-position: left center;

    animation: pastel-background 10s ease-in-out infinite;

    padding: .2em;
    span {
        display: block;
        border-radius: .1em;
        padding: .45em .8em .3em;
        text-shadow: 0 0 .2em #fff;
    }
    &:hover {
        animation: box-glow 10s ease-in-out infinite;
        span {
            background: #fff;
            box-shadow: 0 0 .2em #fff;
            color: $pastel1;
            animation: text-glow 10s ease-in-out infinite;
        }
    }
}

.expand {
    display: inline-block;
    margin: auto;
    height: auto;
    box-sizing: border-box;
    border-radius: .5em;
    position: relative;
    background: $greenish;
    max-width: 12em;

    transition: padding .5s ease-out,
        max-width .25s ease-in;
    text-align: center;

    .hide {
      display: none;
        max-height: 0;
        overflow: hidden;
        transition: max-height .5s ease-in .5s;
    }
    input {
        box-sizing: border-box;
        display: block;
        width: 100%;
        padding: .5em;
        margin: .25em auto;
        background: #eee;
        color: #333;
        border: none;
        font-family: "Overpass", sans-serif;
        font-size: $fontsize;
        &:first-child {
            margin-bottom: .5em;
        }
    }
    .button {
        box-sizing: border-box;
        border: .1em solid $greenish;
        text-align: center;
        margin: 0 auto;
        width: 100%;
        max-width: 6.5em;
        transition: max-width .5s ease-out,
            margin .5s ease-out,
            max-width .5s ease-in;

        &:hover, &:active {
            background: #fff;
            color: $greenish;
            border-color: #fff;
        }
    }
    .action {
        background: $greenish;
        color: #fff;
        white-space: nowrap;
        &:hover, &:active {
            border-color: $greenish;
        }
    }
    .cancel {
        background: $greenish;
        color: #fff;
        border-color: #fff;
    }

    &.active {
        padding: 3em;
        max-width: 30em;
        .hide {
            max-height: 20em;
        }
        .button {
            max-width: 30em;

            margin: .25em auto;
        }
        .action {
            background: #fff;
            color: $greenish;
            border-color: #fff;
        }
    }
}

@keyframes rattle {
    0% {
            transform: rotateZ(0) scale(1);
    }
    94% {
            transform: rotateZ(0) scale(1);
            box-shadow: 0 .1em .2em transparentize(darken($blue, 30%), 0.5);
    }
    95% {
            transform: rotateZ(2deg) scale(1.1);
            box-shadow: 0 .1em .5em transparentize(darken($blue, 20%), 0.5);
    }
    97% {
            transform: rotateZ(-2deg) scale(1.1);
    }
    99% {
            transform: rotateZ(2deg) scale(1.1);
            box-shadow: 0 .1em .5em transparentize(darken($blue, 20%), 0.5);
    }
    100% {
            transform: rotateZ(0) scale(1);
            box-shadow: 0 .1em .2em transparentize(darken($blue, 30%), 0.5);
    }
}
@keyframes reflection {
  0% {
    background-position: right bottom;
  }
  40% {
    background-position: right bottom;
  }
  60% {
    background-position: left top;
  }
  100% {
    background-position: left top;
  }
}
@keyframes turny {
  0% {
    transform: rotateY(0);
  }
  42% {
    transform: rotateY(0);
  }
  45% {
    transform: rotateY(20deg);
  }
  55% {
    transform: rotateY(-5deg);
  }
  57% {
    transform: rotateY(0);
  }
  100% {
    transform: rotateY(0);
  }
}
@keyframes pastel-background {
    0% {
        background-position: 0% 50%;
    }
    33% {
        background-position: 75% 100%;
    }
    66% {
        background-position: 100% 0%;
    }
    100% {
        background-position: 0% 50%;
    }
}
@keyframes text-glow {
    0% {
        color: $pastel1;
        text-shadow: 0 0 .2em $pastel1;
    }
    33% {
        color: $pastel2;
        text-shadow: 0 0 .2em $pastel2;
    }
    66% {
        color: $pastel3;
        text-shadow: 0 0 .2em $pastel3;
    }
    100% {
        color: $pastel1;
        text-shadow: 0 0 .2em $pastel1;
    }
}
@keyframes box-glow {
    0% {
        box-shadow: 0 0 .4em $pastel1;
    }
    33% {
        box-shadow: 0 0 .4em $pastel2;
    }
    66% {
        box-shadow: 0 0 .4em $pastel3;
    }
    100% {
        box-shadow: 0 0 .4em $pastel1;
    }
}
@keyframes show-controls {
    0% {
        max-height: 0;
    }
    100% {
        max-height: 10em;
    }
}
@keyframes hide-controls {
    0% {
        max-height: 10em;
    }
    100% {
        max-height: 0;
    }
}

              
            
!

JS

              
                $(document).ready(function() {

    $(".action, .cancel").click(function (e) {
       e.preventDefault(); $(".expand").toggleClass("active");
    });
});

              
            
!
999px

Console