finished up to bootstrap

lectures/lec2/part4/task1.html

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+<div class="container">
+    <div>1</div>
+    <div>2</div>
+    <div>3</div>
+    <div>4</div>
+    <div>5</div>
+    <div>6</div>
+    <div>7</div>
+    <div>8</div>
+</div>
+
+<style>
+.container {
+    display: flex;
+    flex-wrap: no-wrap;
+    background: LightGreen;
+}
+.container div {
+    min-width: 120px;
+    height: 50px;
+    margin: 5px;
+    border: solid thin green;
+}
+</style>

lectures/lec2/part4/task2.html

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+
+
+<style>
+.pict {
+    display: flex;
+    flex-wrap: nowrap;
+
+    justify-content: center;
+    align-items: center;
+}
+
+.pict a img {
+    min-width:280px;
+    min-height:280px;
+}
+
+@media (max-width: 1000px) {
+    .pict {
+        flex-wrap: wrap;
+    }
+}
+
+@media (max-width: 700px) {
+    .pict {
+        flex-direction: column;
+        align-items: center;
+    }
+}
+</style>
+<hr>
+<div class="pict">
+    <a href="#"><img src="images/image_1.jpg"></a>
+    <a href="#"><img src="images/image_2.jpg"></a>
+    <a href="#"><img src="images/image_3.jpg"></a>
+    <a href="#"><img src="images/image_4.jpg"></a>
+    <a href="#"><img src="images/image_5.jpg"></a>
+</div>
+<hr>

lectures/lec2/part4/task3.html

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+<style>
+    .pict {
+        display: flex;
+        flex-wrap: nowrap;
+
+        justify-content: center;
+        align-items: center;
+    }
+
+    .pict a img {
+        min-width: 280px;
+        min-height: 280px;
+    }
+
+    .big {
+        min-width: 330px;
+        min-height: 330px;
+    }
+
+    @media (max-width: 1000px) {
+        .pict {
+            flex-wrap: wrap;
+        }
+
+        .big {
+            min-width: 280px;
+            min-height: 280px;
+        }
+    }
+
+    @media (max-width: 700px) {
+        .pict {
+            flex-direction: column;
+            align-items: center;
+        }
+    }
+</style>
+<hr>
+<div class="pict">
+    <a href="#"><img src="images/image_1.jpg"></a>
+    <a href="#"><img src="images/image_2.jpg"></a>
+    <a href="#" class="big"><img src="images/image_3.jpg"></a>
+    <a href="#"><img src="images/image_4.jpg"></a>
+    <a href="#"><img src="images/image_5.jpg"></a>
+</div>
+<hr>