You can use the grid-template-columns property to set the size of the grid columns, and use the grid-column property to define which grid columns your grid items belong to.

To make one grid item resize while keeping the other intact in size, you can set the grid item you want to resize to span across multiple columns using the grid-column property. Then, you can adjust the size of the columns that the other grid item belongs to, without affecting the size of the grid item that spans across multiple columns.

Here's an example in CSS:

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.grid-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr); /* create three columns of equal width */
}

.grid-item-1 {
  grid-column: 1 / span 2; /* make this item span two columns */
  background-color: red;
}

.grid-item-2 {
  background-color: blue;
}

In this example, grid-item-1 will span across columns 1 and 2, while grid-item-2 will only belong to column 3. You can then adjust the width of column 3, without affecting the size of grid-item-1.

Here's a visual example of how the grid would look like:

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 _______________________________
|        |        |              |
| grid-1 | grid-1 |    grid-2    |
|________|________|______________|

To set the container size of specific grid boxes in CSS Grid, you can use the grid-template-rows and grid-template-columns properties and define the size of each row and column respectively.

Here is an example of setting the size of the first and third columns of a 3-column grid to be 100px and the second column to be 200px:

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.grid-container {
  display: grid;
  grid-template-columns: 100px 200px 100px;
}

You can also use other units for your grid container size, like fr for specifying the size as a fraction of the available space.

Here's an example of having the middle column take up twice as much space as the other two:

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.grid-container {
  display: grid;
  grid-template-columns: 1fr 2fr 1fr;
}

For more information on CSS Grid, refer to the MDN web docs.

To make the sidebar wider, you can adjust the grid-template-columns property in the .container class.

You can increase the width of the first column by increasing the value of 100px and decreasing the value of 1fr in the next two columns. For example, you can change grid-template-columns: 100px 1fr 1fr; to grid-template-columns: 200px 1fr 1fr; to make the sidebar twice as wide.

Updated code:

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.sidebar {
  grid-column: 1 / span 1;
  grid-row: 1 / span 2;
  display: grid;
  grid-template-rows: repeat(7, 1fr);
  grid-gap: 10px;
  background-color: var(--bs-log);
  color: #fff;
  text-align: center;
  margin-top: 40px;
  /* Update sidebar width */
  width: 200px;
}

.container {
  display: grid;
  /* Update grid template columns */
  grid-template-columns: 200px 1fr 1fr;
  grid-template-rows: 100px 1fr;
  grid-gap: 20px;
  height: 100vh;
}

To display 3 cards in a grid of 3 columns, you can use the CSS Grid Layout. Here's an example code snippet that includes three cards displayed in three columns:

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<div class="grid-container">
  <div class="card">Card 1 content goes here</div>
  <div class="card">Card 2 content goes here</div>
  <div class="card">Card 3 content goes here</div>
</div>

<style>
.grid-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-gap: 20px;
}

.card {
  background-color: #fff;
  padding: 20px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
</style>

In this example, the grid-template-columns property defines a grid with three equal columns, and grid-gap adds a 20-pixel gap between the cards. The .card class styles the cards with a white background, padding, and a slight shadow effect.

You can adjust the styles of the .card class and the grid-container, to customize the appearance of the cards and the grid to your preference.

grid-template-columns and grid-template-rows are CSS properties used in CSS Grid Layout.

grid-template-columns defines the number and size of columns in a grid container, while grid-template-rows defines the number and size of rows in the grid container.

Here is an example of how they can be used:

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.grid-container {
  display: grid;
  grid-template-columns: 100px 50px 200px; /* Three columns, 100px, 50px, and 200px wide */
  grid-template-rows: 50px 100px; /* Two rows, 50px and 100px tall */
}

In the example above, the grid-container has three columns, with the first column being 100px wide, the second being 50px wide, and the third being 200px wide. It also has two rows, with the first row being 50px tall and the second being 100px tall.

It depends on the language and framework you are using. Generally speaking, to fix horizontal scrolling on small screens, you need to make sure the width of the elements is not exceeding the width of the viewport. If you are using CSS, one way you can do this is by using @media queries to set different widths based on the screen size.

Here is an example using CSS Grid:

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@media only screen and (max-width: 800px) {
  .container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  }
}

In CSS you can fix a two-column grid with the display: grid; and grid-template-columns properties. Example Code:

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div {
  display: grid;
  grid-template-columns: 1fr 1fr;
}