.theme-button{
    height: 30px; 
    width: 30px;
    border-radius: 50%;
    border-style: solid;
      border-width: 5px;
    cursor: pointer;
    margin-left: 7px;
}

.theme-button:hover{
    border-width: 3px;
}

.theme-div{
    float:left;
}