friendica-github/view/theme/vier/mobile.css

aside, header, #nav-events-link, #search-box, #nav-admin-link, #activitiy-by-date-tab, #shared-links-tab,
.wall-item-location {
  display: none;
}

.hide-comments-outer {
  width: calc(100% - 105px);
}

section {
  /* left: calc((100% - (784px)) / 2); */
  left: 0px;
  width: calc(100% - 20px);
  max-width: 100%;
  padding: 10px;
}

body, section, nav .nav-menu, div.pager, ul.tabs, .wall-item-container .wall-item-ago, .wall-item-network,
.type-link blockquote, .type-video blockquote {
  font-size: 16px;
}

nav {
  min-width: 480px;
}

.wall-item-container .wall-item-content {
  max-width: 100%;
/*  margin-left: -70px;
  padding-top: 25px; */
}

nav ul {
    margin-left: 0px;
}


.wall-item-container .wall-item-content img,
.children .wall-item-container .wall-item-item .wall-item-content img,
.wall-item-container .wall-item-content .type-link img.attachment-image, .type-link img.attachment-image, .type-video img.attachment-image {
  max-width: 650px;
}

@media screen and (max-width: 800px) {
  .wall-item-container .wall-item-content img,
  .children .wall-item-container .wall-item-item .wall-item-content img,
  .wall-item-container .wall-item-content .type-link img.attachment-image, .type-link img.attachment-image, .type-video img.attachment-image {
    max-width: 450px;
  }
}

@media screen and (max-width: 600px) {
  .wall-item-container .wall-item-content img,
  .children .wall-item-container .wall-item-item .wall-item-content img,
  .wall-item-container .wall-item-content .type-link img.attachment-image, .type-link img.attachment-image, .type-video img.attachment-image {
    max-width: 350px;
  }
}

@media screen and (max-width: 480px) {
  .wall-item-container .wall-item-content img,
  .children .wall-item-container .wall-item-item .wall-item-content img,
  .wall-item-container .wall-item-content .type-link img.attachment-image, .type-link img.attachment-image, .type-video img.attachment-image {
    max-width: 200px;
  }
}

.wall-item-container.thread_level_2,
.wall-item-container.thread_level_3,
.wall-item-container.thread_level_4,
.wall-item-container.thread_level_5,
.wall-item-container.thread_level_6,
.wall-item-container.thread_level_7 {
  margin-left: 60px;
  width: calc(100% - 70px);
}

.wall-item-container.thread_level_2 .wall-item-content,
.wall-item-container.thread_level_3 .wall-item-content,
.wall-item-container.thread_level_4 .wall-item-content,
.wall-item-container.thread_level_5 .wall-item-content,
.wall-item-container.thread_level_6 .wall-item-content,
.wall-item-container.thread_level_7 .wall-item-content {
  max-width: 100%;
}