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;
}

.main {
    background: #e2e2e2;
    width: 100%;
    position: absolute;
    top: 0;
    bottom: 0;
}

.div-center {
    width: 400px;
    height: 400px;
    background-color: #fff;
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    margin: auto;
    max-width: 100%;
    max-height: 100%;
    overflow: auto;
    padding: 1em 2em;
    border-bottom: 2px solid #ccc;
    display: table;
}

div.content {
    display: table-cell;
    vertical-align: middle;
}

.line-through-btw {
    width: 100%;
    text-align: center;
    border-bottom: 1px solid #000;
    line-height: 0.1em;
    margin: 10px 0 20px;
}

    .line-through-btw span {
        background: #fff;
        padding: 0 10px;
    }