html {
  font-size: 14px;
}

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

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

body {
  margin-bottom: 60px;
}

.loader {
    position: fixed;
    z-index: 99;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: white;
    display: flex;
    justify-content: center;
    align-items: center;
}

    .loader > img {
        width: 100px;
    }

    .loader.hidden {
        animation: fadeOut 1s;
        animation-fill-mode: forwards;
    }

@keyframes fadeOut {
    100% {
        opacity: 0;
        visibility: hidden;
    }
}

.thumb {
    height: 100px;
    border: 1px solid black;
    margin: 10px;
}