.line {
height: 5px;
}
.gradient {
background: linear-gradient(to right, green , blue);
}<div class="line gradient"></div>.block:hover {
border: 1px solid;
border-color: #333333;
padding: 1.73vw;
}li{
list-style: none;
margin-left: 40px;
border-bottom: ...
}
li:before {
...
margin-left: -40px
}