Cómo Colocar Botones en Diseño Web - Necesito Ayuda

<div class="cajaHerra">
    <div class="divTab">
        <div>
            <div class="cajImg">
                <img src="public/img/arriendo.png">
            </div>
            <p>Formatos de vinculacion</p>
        </div>
    </div>
</div>

.cajaHerra {
    width: 220px;
    height: 220px;
    background-color: #fff;
    float: left;
    text-align: center;
    border-radius: 50%;
    margin: 0 3%;
}

.divTab {
    display: table;
    width: 100%;
    height: 100%;
}

.divTab > div {
    display: table-cell;
    vertical-align: middle;
}

.cajImg {
    width: 90px;
    height: 92px;
    margin: 0 auto;
    display: table;
}

.cajaHerra img {
    width: 100%;
    display: table-cell;
    vertical-align: middle;
    margin: 0 auto;
}

.cajaHerra p {
    font-size: 1.3em;
    width: 80%;
    margin: 0 auto;
}

<div class="container">
  <a class="button circle" href="#">welcome</a>
</div>

@circle-size: 100px;
@outside-circle-size: @circle-size + 10px;
@outside-circle-border: 2px;
@outside-circle-margin: ((@outside-circle-size / 2) + @outside-circle-border) * -1;

.button{
  text-align: center;
  text-transform: uppercase;
  text-decoration: none;
  font-size: 14px;
  font-weight: 100;
  font-family: "Segoe UI";
  letter-spacing: 1px;

  &:before{
    border-radius: @circle-size;
    border: @outside-circle-border solid #468cdc;
    box-shadow: 0 0 15px rgba(0, 255, 204, 0.15), 0 0 15px rgba(0, 255, 204, 0.15) inset;
    content: "";
    display: block;
    position: absolute;
    left: 50%;
    top: 50%;
    height: @outside-circle-size;
    width: @outside-circle-size;
    margin-left: @outside-circle-margin;
    margin-top: @outside-circle-margin;    
    opacity: 1;
    transform: scale(1);
    transition: all 300ms;
  }
  
  &:hover:before{
    transform: scale(1.05);
  }
  
  &.circle{
    background: #23466e;
    border: none;
    border-radius: 900px;
    color: #e4ecfa;
    cursor: pointer;
    display: block;
    width: @circle-size;
    height: @circle-size;  
    line-height: @circle-size;  
    position: relative;
    margin: auto;
    margin-top: 25px;
    transition: 0.5s;
    
    &:hover {
      background: #3e70aa;
      padding: -2px;
    }
  }
}

.container{
  background-color: rgb(5, 40, 60);
  position: fixed;
  width: 100%;
  height: 100%;
  top: 0;
  overflow: auto;
}