html {
  font-size: 14px;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
  box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem #258cfb;
}

html {
  position: relative;
  min-height: 100%;
}

body {
  margin-bottom: 60px;
}

.page-header {
    background-color: antiquewhite;
    height: 40px;
    vertical-align: text-top;
}

.img_header {
    background-color: antiquewhite;
    height: 40px;
}

.header-text {
    height: 40px;
    vertical-align: top;
}

.windows {
    background-color: white;
    display: block;
    width: 50%;
    height: 100%;
    float: left;
}

.linux {
    background-color: white;
    display: block;
    float: right;
    width: 50%;
    height: 100%;
}

.block_bottom {
    background-color: antiquewhite;
    display: block;
    position: absolute;
    bottom: 0;
    height: 40px;
    width: 100%;
}

.img_list_item{
    height: 30px;
    widtch: 33px;
}

.img_show {
    width: calc(100% - 50px);
    max-width: 100%;
    height: auto;
    max-height: calc(100% - 50 px);
    object-fit:contain;
    margin-top: 50px;
    border:solid gray 2px;
    object-fit:contain;
}

.h1 {
    text-decoration:none;
}

.img_app {
    max-height: 250px;
    max-width:auto;
}