[hidden] {
  display: none;
}

*,
*:before,
*:after {
  box-sizing: border-box;
}

html {
  font-size: 10px;
}

body {
  font-family: 'Open Sans', Helvetica, Arial, sans-serif;
  font-size: 18px;
  font-weight: 300;
  line-height: 1.4;
  color: #333;
  background-color: #fff;
}

a {
  color: #1976D2;
  text-decoration: none;
  transition: color 0.3s;
}

a:hover, a:focus {
  color: #2196F3;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 300;
}

h1 small, h2 small, h3 small, h4 small, h5 small, h6 small {
  font-size: 60%;
}

h1, h2 {
  margin: 0 0 20px 0;
}

h3, h4, h5, h6 {
  margin: 0 0 15px 0;
}

h1 {
  font-size: 38px;
}

h2 {
  font-size: 34px;
}

h3 {
  font-size: 26px;
}

h4 {
  font-size: 20px;
}

h5 {
  font-size: 16px;
}

h6 {
  font-size: 14px;
}

p {
  margin: 0 0 15px 0;
}

strong {
  font-weight: 400;
}

.container {
  width: 100%;
  max-width: 1140px;
  margin-right: auto;
  margin-left: auto;
  padding-left: 15px;
  padding-right: 15px;
}

.container:before, .container:after {
  content: " ";
  display: table;
}

.container:after {
  clear: both;
}

.row {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-wrap: wrap;
      flex-wrap: wrap;
  margin-right: -15px;
  margin-left: -15px;
}

.col-sm-4 {
  position: relative;
  width: 100%;
  padding-left: 15px;
  padding-right: 15px;
  min-height: 1px;
}

@media (min-width: 576px) {
  .col-sm-4 {
    -webkit-box-flex: 0;
        -ms-flex: 0 0 33.333333%;
            flex: 0 0 33.333333%;
    max-width: 33.333333%;
  }
}

.img-fluid {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
  border-style: none;
}
.demo {
  margin-top: 20px;
  margin-bottom: 40px;
}