[html]
<a href="#" class="btn btn_reg" data-open-window="registration">
  <div class="btn__content">Sign-Up</div>
</a>

<style>
body {
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  height: 100vh;
  font-family: tahoma;
  background-color: rgb(60, 60, 60);
}

/* btn */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  text-decoration: none;
  text-align: center;
  color: white;
  font-family: var(--font-main);
  font-weight: 700;
  font-size: 1.5rem;
  line-height: 14px;
  letter-spacing: 0;
  padding: 5px 10px;
  min-height: 60px;
  cursor: pointer;
  transition: 0.2s all;
  flex-shrink: 0;
  text-shadow: none;
  text-transform: uppercase;
  box-shadow: none;
  position: relative;
  z-index: 0;
  border: 0;
  outline: 0;
  background-color: transparent;
  border-radius: 0;
  width: 240px;
}

.btn:before,
.btn:after {
  content: "";
  display: block;
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: -1;
  background: linear-gradient(
    90deg,
    #e21d5a 0%,
    #ff3300 40%,
    #ffa800 65%,
    #e21d5a 100%
  );
  background-size: 300% 300%;
  border: 0;
  border-radius: 0;
  transition: 0.3s all;
  clip-path: polygon(
    0 0,
    calc(100% - 10px) 0,
    100% 10px,
    100% 100%,
    10px 100%,
    0 calc(100% - 10px)
  );
}

.btn:hover:before {
  transition: 0.3s all;
  background-position: 100% 100%;
  clip-path: polygon(
    0 0,
    calc(100% - 20px) 0,
    100% 20px,
    100% 100%,
    20px 100%,
    0 calc(100% - 20px)
  );
}

.btn:after {
  content: "";
  display: block;
  position: absolute;
  top: -5px;
  right: -5px;
  bottom: -5px;
  left: -5px;
  z-index: -2;
  opacity: 0.3;
}

.btn:hover:after {
  transition: 0.3s all;
  background-position: 100% 100%;
  clip-path: polygon(
    0 0,
    calc(100% - 20px) 0,
    100% 20px,
    100% 100%,
    20px 100%,
    0 calc(100% - 20px)
  );
}

.btn__content {
  position: relative;
  z-index: 5;
  display: inline-block;
  flex-grow: 1;
  min-width: 0;
}
</style>
[/html]

HTML:
<a href="#" class="btn btn_reg" data-open-window="registration">
  <div class="btn__content">Sign-Up</div>
</a>

CSS:
body {
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  height: 100vh;
  font-family: tahoma;
  background-color: rgb(60, 60, 60);
}

/* btn */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  text-decoration: none;
  text-align: center;
  color: white;
  font-family: var(--font-main);
  font-weight: 700;
  font-size: 1.5rem;
  line-height: 14px;
  letter-spacing: 0;
  padding: 5px 10px;
  min-height: 60px;
  cursor: pointer;
  transition: 0.2s all;
  flex-shrink: 0;
  text-shadow: none;
  text-transform: uppercase;
  box-shadow: none;
  position: relative;
  z-index: 0;
  border: 0;
  outline: 0;
  background-color: transparent;
  border-radius: 0;
  width: 240px;
}

.btn:before,
.btn:after {
  content: "";
  display: block;
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: -1;
  background: linear-gradient(
    90deg,
    #e21d5a 0%,
    #ff3300 40%,
    #ffa800 65%,
    #e21d5a 100%
  );
  background-size: 300% 300%;
  border: 0;
  border-radius: 0;
  transition: 0.3s all;
  clip-path: polygon(
    0 0,
    calc(100% - 10px) 0,
    100% 10px,
    100% 100%,
    10px 100%,
    0 calc(100% - 10px)
  );
}

.btn:hover:before {
  transition: 0.3s all;
  background-position: 100% 100%;
  clip-path: polygon(
    0 0,
    calc(100% - 20px) 0,
    100% 20px,
    100% 100%,
    20px 100%,
    0 calc(100% - 20px)
  );
}

.btn:after {
  content: "";
  display: block;
  position: absolute;
  top: -5px;
  right: -5px;
  bottom: -5px;
  left: -5px;
  z-index: -2;
  opacity: 0.3;
}

.btn:hover:after {
  transition: 0.3s all;
  background-position: 100% 100%;
  clip-path: polygon(
    0 0,
    calc(100% - 20px) 0,
    100% 20px,
    100% 100%,
    20px 100%,
    0 calc(100% - 20px)
  );
}

.btn__content {
  position: relative;
  z-index: 5;
  display: inline-block;
  flex-grow: 1;
  min-width: 0;
}

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