@mixin underline-on-hover($underline-color) {

text-decoration: underline;
text-decoration-color: transparent;
transition: 0.4s;
-webkit-text-decoration-color: transparent;
-moz-text-decoration-color: transparent;
&:hover {
  text-decoration-color: $underline-color;
  -webkit-text-decoration-color: $underline-color;
  -moz-text-decoration-color: $underline-color;
}

}

@mixin tooltip {

position: relative;
&:hover .tooltip {
    visibility: visible;
    opacity: 1;
  }
& .tooltip {
    visibility: hidden;
    width: 120px;
    background-color: #555;
    color: #fff;
    text-align: center;
    border-radius: 6px;
    padding: 5px 0;
    position: absolute;
    z-index: 1;
    bottom: 100%;
    left: 50%;
    margin-left: -60px;
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 14px;
    &::after {
        content: "";
        position: absolute;
        top: 100%;
        left: 50%;
        margin-left: -5px;
        border-width: 5px;
        border-style: solid;
        border-color: #555 transparent transparent transparent;
      }
}

}

@mixin hyperlink-convention {

  a {
    cursor: pointer;
    @include underline-on-hover($hyperlink);
    color: $hyperlink;
}

}