1 col ptfl in CSS

/* Sticky footer styles
-------------------------------------------------- */
html {
  position: relative;
  min-height: 100%;
}

body {
    /* margin-top: 50px; */
    /* 50px is the height of the navbar */
}

.category {
  text-transform: capitalize;
}

.page-header {
  text-transform: capitalize;
}

footer {
  margin-top: 50px;
  margin-bottom: 10px;
}

footer .row {
  margin-bottom: 10px;
}

pre {
  overflow-x: auto;
}
pre code {
  overflow-wrap: normal;
  white-space: pre;
}

.figure {
  display: block;
  margin-top: 30px;
  margin-bottom: 30px;
}

@media (max-width: 1000px) {
    .navbar-header {
        float: none;
    }
    .navbar-left,.navbar-right {
        float: none !important;
    }
    .navbar-toggle {
        display: block;
    }
    .navbar-collapse {
        border-top: 1px solid transparent;
        box-shadow: inset 0 1px 0 rgba(255,255,255,0.1);
    }
    .navbar-top {
        border-width: 0 0 1px;
    }
    .navbar-fixed-top {
        top: 0;
        border-width: 0 0 1px;
    }
    .navbar-collapse.collapse {
        display: none!important;
    }
    .navbar-nav {
        float: none!important;
        margin-top: 7.5px;
    }
    .navbar-nav>li {
        float: none;
    }
    .navbar-nav>li>a {
        padding-top: 10px;
        padding-bottom: 10px;
    }
    .collapse.in{
        display:block !important;
    }
}