1label, .bubble {
2  display: block;
3  -webkit-tap-highlight-color: transparent;
4}
5
6label {
7  animation: float74 4s ease-in-out infinite;
8}
9
10.bubble, .bubble:before, .bubble:after {
11  transition-duration: 0.2s;
12}
13
14.bubble, .bubble:after {
15  border-radius: 50%;
16}
17
18.bubble {
19  background-image: radial-gradient(8% 8% at 22% 28%,hsl(0,0%,100%) 45%,hsla(0,0%,100%,0) 50%),
20		radial-gradient(8% 8% at 23% 27%,hsl(0,0%,100%) 45%,hsla(0,0%,100%,0) 50%),
21		radial-gradient(8% 8% at 24% 26%,hsl(0,0%,100%) 45%,hsla(0,0%,100%,0) 50%),
22		radial-gradient(8% 8% at 25% 25%,hsl(0,0%,100%) 45%,hsla(0,0%,100%,0) 50%),
23		radial-gradient(8% 8% at 26% 24%,hsl(0,0%,100%) 45%,hsla(0,0%,100%,0) 50%),
24		radial-gradient(8% 8% at 27% 23%,hsl(0,0%,100%) 45%,hsla(0,0%,100%,0) 50%),
25		radial-gradient(8% 8% at 28% 22%,hsl(0,0%,100%) 45%,hsla(0,0%,100%,0) 50%);
26  box-shadow: 0 -0.06em 0.1em hsl(0,90%,100%) inset,
27		0 -0.15em 0.4em hsl(0,90%,45%) inset,
28		0 0.05em 0.05em hsl(0,90%,45%) inset,
29		0.05em 0 0.1em hsl(0,90%,100%) inset,
30		-0.05em 0 0.1em hsl(0,90%,100%) inset,
31		0 0.1em 0.4em hsl(0,90%,60%) inset;
32  cursor: pointer;
33  position: relative;
34  width: 3em;
35  height: 3em;
36  transform-style: preserve-3d;
37  transition-property: box-shadow, transform, width, height;
38  transition-timing-function: ease-in-out, ease-in-out, var(--bubbleTiming), var(--bubbleTiming);
39  will-change: transform;
40  -webkit-appearance: none;
41  appearance: none;
42  z-index: 0;
43}
44
45.bubble:before, .bubble:after {
46  content: "";
47  display: block;
48  position: absolute;
49  transition-timing-function: var(--bubbleTiming);
50}
51
52.bubble:before {
53  border-radius: 0.75em;
54  box-shadow: 0 0 0 0.5em hsl(0,0%,100%) inset;
55  filter: drop-shadow(0.6em 0.6em 4px hsla(0,0%,0%,0.2));
56  top: 50%;
57  left: 50%;
58  width: 1.5em;
59  height: 1.5em;
60  transform: translate3d(-50%,-50%,-1px);
61  z-index: -1;
62}
63
64.bubble:after {
65  background: radial-gradient(100% 100% at center,hsla(0,0%,0%,0) 35%,hsla(0,0%,0%,0.2) 48%,hsla(0,0%,0%,0) 50%);
66  filter: blur(4px);
67  top: 0.6em;
68  left: 0.6em;
69  width: 100%;
70  height: 100%;
71  transform: translate3d(0,0,-1px);
72  z-index: -2;
73}
74
75.bubble:focus, .bubble:hover {
76  transform: scale(1.1);
77  outline: none;
78}
79
80.bubble:focus:active, .bubble:hover:active {
81  width: 3.6em;
82  height: 2.4em;
83}
84
85.bubble:focus:before, .bubble:hover:before {
86  filter: drop-shadow(0.75em 0.75em 4px hsla(0,0%,0%,0.2));
87}
88
89.bubble:focus:after, .bubble:hover:after {
90  transform: translate3d(0.15em,0.15em,-1px);
91}
92
93.bubble:checked {
94  box-shadow: 0 -0.06em 0.1em hsl(120,90%,100%) inset,
95		0 -0.15em 0.4em hsl(120,90%,45%) inset,
96		0 0.05em 0.05em hsl(120,90%,45%) inset,
97		0.05em 0 0.1em hsl(120,90%,100%) inset,
98		-0.05em 0 0.1em hsl(120,90%,100%) inset,
99		0 0.1em 0.4em hsl(120,90%,60%) inset;
100}
101
102.bubble:checked:before {
103  border-radius: 0.25em;
104  width: 0.5em;
105}
106/* Reduced motion */
107@media (prefers-reduced-motion: reduce) {
108  label {
109    animation: none;
110  }
111
112  .bubble, .bubble:before, .bubble:after {
113    transition-duration: 0s;
114  }
115
116  .bubble:focus, .bubble:hover {
117    transform: scale(1);
118  }
119
120  .bubble:focus:active, .bubble:hover:active {
121    width: 3em;
122    height: 3em;
123  }
124
125  .bubble:focus:before, .bubble:hover:before {
126    filter: drop-shadow(0.6em 0.6em 4px hsla(0,0%,0%,0.2));
127  }
128
129  .bubble:focus:after, .bubble:hover:after {
130    transform: translate3d(0,0,-1px);
131  }
132}
133/* Animations */
134@keyframes float74 {
135  from, to {
136    transform: translate(0,3%);
137  }
138
139  25% {
140    transform: translate(-3%,0);
141  }
142
143  50% {
144    transform: translate(0,-3%);
145  }
146
147  75% {
148    transform: translate(3%,0);
149  }
150}