How to change the blogger sidebar gadget shape ?

Read from here

Take Theme --> Customize --> Advanced --> Add CSS

Copy the code there .
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.Label li {
background: linear-gradient(to bottom, #6B6B6B 0%, #6B6B6B 4%, #333333 1%, #2B2B2B 100%) repeat scroll 0 0 transparent;
border: 1px solid;
border-radius: 6px 6px 6px 6px;
float: left;
font-size: 116%;
list-style: none outside none;
margin: 2px;
padding: 4px;
transition: all 0.3s ease 0s;
}
.Label li:hover {
transform: rotate(351deg) scale(1.7);
}
.Label a {
color: #fff;
text-decoration: none;
}

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