JSFiddle - React, Tailwind, and code Playground

HTML

<div class="smallmenu"><a id="hoverr" class="cornermenu" href="#methods"><span class="Capital">M</span>
<span class="smalltext">Methods</span></a><a id="hoverr" class="cornermenu" href="#background"><span class="Capital">B</span>
<span class="smalltextpub">Background</span></a><a id="hoverr" class="cornermenu" href="#results"><span class="Capital">R</span>
<span class="smalltext">Results</span></a><a id="hoverr" class="cornermenu" href="#publications"><span class="Capital">P</span>
<span class="smalltextpub">Publications</span></a></div>

CSS

.smallmenu {
    margin: 0 auto;
    max-width: 436px;
    width: 100%;
  }

  .Capital {
    margin: 0px 0 -5px 0;
    line-height: 63px;
    font-size: 60px;
    font-weight: ligter;
  }

  .smalltext {
    text-align: center;
    margin-top: 0px !important;
    font-weight: 100px;
    font-size: 14px;
  }

  .smalltextpub {
    text-align: center;
    margin-top: 0px !important;
    font-weight: 100px;
    font-size: 14px;
    margin-left: -5px;
  }

  .cornermenu {
    display: inline-block;
    margin: 2px;
    border-radius: 25px;
    background: #769DBD;
    padding: 20px;
    width: 100px;
    height: 100px;
    text-align: center;
    color: #fff;
    font-family: Arial;
    padding-top: 10px;
    text-decoration: none;
  }

  #hoverr:hover {
    border-radius: 25px;
    background: #464646;
    padding: 20px;
    width: 100px;
    height: 100px;
    text-align: center;
    color: #fff;
    font-family: Arial;
    padding-top: 10px;
    text-decoration: none;
  }

  * {
    box-sizing: border-box;
  }