* {
  box-sizing: border-box;
}
body {
  line-height: 1.5;
  font-family: 'Source Sans Pro';
  -webkit-font-smoothing: antialiased;
}
a {
  text-decoration: none;
  color: inherit;
}
h1 {
  line-height: 1.3;
}
p,
h1,
h3 {
  margin: 0 0 25px 0;
}
.wrapper {
  min-height: 100vh;
  padding: 10vh 10vw;
  background: #fffafa;
}
/* button base */
.btn {
  display: -webkit-inline-box;
  display: -webkit-inline-flex;
  display: -ms-inline-flexbox;
  display: inline-flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: justify;
  -webkit-justify-content: space-between;
      -ms-flex-pack: justify;
          justify-content: space-between;
  margin-bottom: 8.333333333333334px;
  padding: 10px 25px;
  border-radius: 2px;
  line-height: normal;
  font-size: 16px;
  color: #fff;
  background: #fff;
/* svg icon */
/* reveal svg icon */
/* large button */
/* styles */
}
.btn-icon {
  will-change: width, transform;
  width: 0;
  height: 24px;
  padding: 4px;
  border-radius: 50%;
  fill: #fff;
  background: rgba(0,0,0,0.15);
  margin-left: 0;
  -webkit-transform: scale(0);
      -ms-transform: scale(0);
          transform: scale(0);
  -webkit-transition: all 0.3s cubic-bezier(0.23, 1, 0.32, 1);
          transition: all 0.3s cubic-bezier(0.23, 1, 0.32, 1);
/* if you want the icon visible always */
}
.btn-icon--vis {
  width: 24px;
  -webkit-transform: scale(1);
      -ms-transform: scale(1);
          transform: scale(1);
  margin-left: 8.333333333333334px;
}
.btn:hover .btn-icon {
  width: 24px;
  -webkit-transform: scale(1);
      -ms-transform: scale(1);
          transform: scale(1);
  margin-left: 8.333333333333334px;
}
.btn--large {
  font-size: 20px;
}
.btn--large .btn-icon {
  height: 28px;
}
.btn--large:hover .btn-icon {
  width: 28px;
}
.btn--style1 {
  position: relative;
  z-index: 1;
}
.btn--style1:before {
  will-change: opacity;
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  border-radius: 2px;
  background: #000;
  opacity: 0;
  -webkit-transition: all 0.3s cubic-bezier(0.23, 1, 0.32, 1);
          transition: all 0.3s cubic-bezier(0.23, 1, 0.32, 1);
}
.btn--style1:hover:before {
  opacity: 0.2;
}
.btn--style2 .btn-icon {
  -webkit-transform: scale(0) rotate(-360deg);
      -ms-transform: scale(0) rotate(-360deg);
          transform: scale(0) rotate(-360deg);
}
.btn--style3 {
  position: relative;
  z-index: 1;
}
.btn--style3:before {
  will-change: opacity;
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  border-radius: 2px;
  background: #000;
  -webkit-transform: scaleX(0);
      -ms-transform: scaleX(0);
          transform: scaleX(0);
  -webkit-transform-origin: left center;
      -ms-transform-origin: left center;
          transform-origin: left center;
  opacity: 0.2;
  -webkit-transition: all 0.3s cubic-bezier(0.23, 1, 0.32, 1);
          transition: all 0.3s cubic-bezier(0.23, 1, 0.32, 1);
}
.btn--style3:hover:before {
  -webkit-transform: scaleX(1);
      -ms-transform: scaleX(1);
          transform: scaleX(1);
}
.btn--style4 {
  position: relative;
  z-index: 1;
}
.btn--style4:before {
  will-change: opacity;
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  border-radius: 2px;
  background: #000;
  -webkit-transform: scaleY(0);
      -ms-transform: scaleY(0);
          transform: scaleY(0);
  -webkit-transform-origin: center bottom;
      -ms-transform-origin: center bottom;
          transform-origin: center bottom;
  opacity: 0.2;
  -webkit-transition: all 0.3s cubic-bezier(0.23, 1, 0.32, 1);
          transition: all 0.3s cubic-bezier(0.23, 1, 0.32, 1);
}
.btn--style4:hover:before {
  -webkit-transform: scaleY(1);
      -ms-transform: scaleY(1);
          transform: scaleY(1);
}
/* block buttons */
.flex {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
}
.flex > .btn {
  -webkit-box-flex: 1;
  -webkit-flex: 1;
      -ms-flex: 1;
          flex: 1;
  margin-right: 3px;
}
.flex > .btn:last-child {
  margin-right: 0;
}
.max-w {
  max-width: 600px;
}
/* color classes */
.red {
  background: #f44336;
}
.pink {
  background: #e91e63;
}
.purple {
  background: #9c27b0;
}
.blue {
  background: #2196f3;
}
.teal {
  background: #009688;
}
.green {
  background: #4caf50;
}
.yellow {
  background: #ffeb3b;
}