In order to center one block inside another block, we usually use the classic combination of methods of positioning and setting relative coordinates and negative margins.
This device works well when the centered block has fixed dimensions, but if its dimensions are changed, then there can be problems.
You can solve this problem using transforms and center the blocks with variable sizes. You do this with translate.
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Moving objects horizontally</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/2d-transforms/move-vertically">2. Moving objects vertically</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/2d-transforms/fireball-training">3. Fireball training</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/2d-transforms/increase-decrease-size">4. Increasing and decreasing the size</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/2d-transforms/defend-city">5. Defending the city</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/2d-transforms/begin-journey">6. The beginning of the journey</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/2d-transforms/maze">7. The maze</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/2d-transforms/battle-1">8. 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course-tab--active js--theory-tab__theory"><span class="course-tab__icon"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-theory"></use></svg></span><span class="course-tab__title">Theory</span></li><li class="course-tabs__item course-tabs__item--internal course-tab course-tab--centered js--theory-tab__comments"><span class="course-tab__icon"><svg aria-hidden="true" style="width: 16px; height: 16px; fill: #2e2c9c;"><use xlink:href="/img/sprites/up.svg#comment"></use></svg></span><span class="course-tab__title">Comments</span></li></ul><section class="course-theory__content"><div class="js--theory-pane__theory course-theory__content-inner"><h1 class="course-theory__content-heading">Centering with transform: translate</h1><div class="course-theory__content-text"><p>In order to center one block inside another block, we usually use the <a href="http://css-tricks.com/quick-css-trick-how-to-center-an-object-exactly-in-the-center/" target="_blank" rel="nofollow">classic combination of methods</a> of positioning and setting relative coordinates and negative margins.</p><p>This device works well when the centered block has fixed dimensions, but if its dimensions are changed, then there can be problems.</p><p>You can solve this problem using transforms and center the blocks with variable sizes. You do this with <code>translate</code>.</p></div></div><div class="js--theory-pane__comments hidden course-theory__content-inner"><div class="course-theory__content-text"><h2 class="course-theory__content-heading">Comments</h2><div id="disqus_thread"></div><script>
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</p></div></div><div class="course-browser__menu course-browser__menu--vertical"><button class="course-browser__menu-item course-browser__menu-button course-browser__menu-button--increase" type="button" disabled title="Larger"><span class="course-browser__menu-item-inner">Larger</span></button><span class="course-browser__menu-item course-browser__zoom"><span class="course-browser__menu-item-inner">100%</span></span><button class="course-browser__menu-item course-browser__menu-button course-browser__menu-button--decrease" type="button" title="Smaller"><span class="course-browser__menu-item-inner">Smaller</span></button></div><div class="js--validation-view course-browser__results-restriction course-browser__results-restriction--mini"><span class="tooltip tooltip--light tooltip--short course-browser__results-restriction-tooltip"><span class="js--tooltip-text"></span><button class="js--validation-view-close course-browser__results-restriction-tooltip-close icon-close" type="button">Закрыть</button></span></div></div><div class="course-goals js--goals"><div class="course-goals__heading"><span class="course-goals__heading-title"><span class="course-goals__count-label">Goals</span><span class="course-goals__count">completed</span></span><div class="js--annotations course-task-stats course-task-stats--disabled course-task-stats--centered "><span class="course-task-stats__indicator"><svg width="12" height="12" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg"><path fill-rule="evenodd" clip-rule="evenodd" d="M15 8C15 11.866 11.866 15 8 15C4.13403 15 1 11.866 1 8C1 4.13403 4.13403 1 8 1C11.866 1 15 4.13403 15 8ZM16 8C16 12.4183 12.4183 16 8 16C3.58173 16 0 12.4183 0 8C0 3.58173 3.58173 0 8 0C12.4183 0 16 3.58173 16 8ZM6.7287 3.88849C6.6958 3.59229 6.92761 3.33325 7.22565 3.33325H8.77502C9.07306 3.33325 9.30487 3.59229 9.27197 3.88849L8.71643 8.88849C8.68829 9.14166 8.47424 9.33325 8.21948 9.33325H7.78119C7.52643 9.33325 7.31238 9.14166 7.28424 8.88849L6.7287 3.88849ZM9.33368 12.0001C9.33368 12.7365 8.73669 13.3334 8.00031 13.3334C7.26392 13.3334 6.66699 12.7365 6.66699 12.0001C6.66699 11.2637 7.26392 10.6667 8.00031 10.6667C8.73669 10.6667 9.33368 11.2637 9.33368 12.0001Z" fill="currentColor"></path></svg><span class="js--annotations-counter course-task-stats__counter">0</span></span><div class="course-task-stats__scroller-wrapper"><div class="course-task-stats__scroller"><ul class="js--annotations-list course-task-stats__list"></ul></div></div></div><button class="course-goals__button course-goals__button--expand js--goals__expand" type="button"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-collapse"></use></svg></button><a class="course-goals__button course-goals__button--next button button--green button--without-border hidden" href="/courses/dynamic/2d-transforms/rotate-text" title="Rotating the text in blocks"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#arrow-white--mini"></use></svg></a></div><div class="course-goals__content"><ol class="course-goals__list"><li class="course-goals__list-item">Assign the <code>left: 50%</code> property to the <code>.picture</code> block<span class="mark">.</span></li><li class="course-goals__list-item">And also assign the property <code>top: 50%</code><span class="mark">.</span></li><li class="course-goals__list-item">Then move it by setting <code>translateX</code> to <code>-50%</code><span class="mark">.</span></li><li class="course-goals__list-item">And shift it by <code>-50%</code> using <code>translateY</code>.</li></ol></div></div></div></div></article></div><div class="course-interface__overlay course-interface__overlay--active"></div></main><script
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