CSS

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; font-size: 62.5% }

body,
input,
button,
select,
textarea { font: 600 1rem Poppins; color: #222222; }

a { text-decoration: none; }
a:link { color: #6A26CD; }
a:hover { color: #431488; }
a:active { color: #6A26CD; }
a:visited { color: #6A26CD; }

html, body, #root { height: 100%; }

ul, ol { margin: 0 0 1rem; padding: 0 0 0 1rem; }
table { border-collapse: collapse; }
th { text-align: left; }   
td { vertical-align: middle; }
.wrapper {
  position: relative;
  padding-top: 56.25%; /* 16:9 Aspect Ratio */
}
img {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: auto;
}
<picture>
  <source media="(max-width: 799px)" srcset="elva-480w.jpg">
  <source media="(min-width: 800px)" srcset="elva-800w.jpg">
  <img src="elva-800w.jpg">
</picture>
img {
  height: auto;
  width: 100%;
/* even more control with max-width */
  max-width: 720px;
}

Similiar Collections

Python strftime reference pandas.Period.strftime python - Formatting Quarter time in pandas columns - Stack Overflow python - Pandas: Change day - Stack Overflow python - Check if multiple columns exist in a df - Stack Overflow Pandas DataFrame apply() - sending arguments examples python - How to filter a dataframe of dates by a particular month/day? - Stack Overflow python - replace a value in the entire pandas data frame - Stack Overflow python - Replacing blank values (white space) with NaN in pandas - Stack Overflow python - get list from pandas dataframe column - Stack Overflow python - How to drop rows of Pandas DataFrame whose value in a certain column is NaN - Stack Overflow python - How to drop rows of Pandas DataFrame whose value in a certain column is NaN - Stack Overflow python - How to lowercase a pandas dataframe string column if it has missing values? - Stack Overflow How to Convert Integers to Strings in Pandas DataFrame - Data to Fish How to Convert Integers to Strings in Pandas DataFrame - Data to Fish create a dictionary of two pandas Dataframe columns? - Stack Overflow python - ValueError: No axis named node2 for object type <class 'pandas.core.frame.DataFrame'> - Stack Overflow Python Pandas iterate over rows and access column names - Stack Overflow python - Creating dataframe from a dictionary where entries have different lengths - Stack Overflow python - Deleting DataFrame row in Pandas based on column value - Stack Overflow python - How to check if a column exists in Pandas - Stack Overflow python - Import pandas dataframe column as string not int - Stack Overflow python - What is the most efficient way to create a dictionary of two pandas Dataframe columns? - Stack Overflow Python Loop through Excel sheets, place into one df - Stack Overflow python - How do I get the row count of a Pandas DataFrame? - Stack Overflow python - How to save a new sheet in an existing excel file, using Pandas? - Stack Overflow Python Loop through Excel sheets, place into one df - Stack Overflow How do I select a subset of a DataFrame? — pandas 1.2.4 documentation python - Delete column from pandas DataFrame - Stack Overflow python - Convert list of dictionaries to a pandas DataFrame - Stack Overflow How to Add or Insert Row to Pandas DataFrame? - Python Examples python - Check if a value exists in pandas dataframe index - Stack Overflow