* {
  text-decoration: none;
  list-style-type: none;
}

body {
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  font-family: Consolas;
  background-color: #333;
}

/* First Button */

.button {
  position: relative;
  color: #2196f3;
  display: inline-block;
  text-transform: uppercase;
  font-size: 24px;
  letter-spacing: 0.7vh;
  padding: 15px 30px;
  overflow: hidden;
}

/* Button Lines */

.button__line {
  position: absolute;
  display: block;
}

/* Upper Span */

.button__line-top {
  top: 0;
  left: -100%;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, #2196f3);
}

.button:hover .button__line-top {
  left: 100%;
  transition: 1s;
  transition-delay: 0.25s;
}

/* Bottom Span */

.button__line-bottom {
  bottom: 0;
  right: -100%;
  width: 100%;
  height: 2px;
  background: linear-gradient(270deg, transparent, #2196f3);
}

.button:hover .button__line-bottom {
  right: 100%;
  transition: 1s;
  transition-delay: 0.25s;
}

/* Left Span */

.button__line-left {
  bottom: -100%;
  left: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(360deg, transparent, #2196f3);
}

.button:hover .button__line-left {
  bottom: 100%;
  transition: 1s;
  transition-delay: 0s;
}

/* Right Span */

.button__line-right {
  top: -100%;
  right: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(180deg, transparent, #2196f3);
}

.button:hover .button__line-right {
  top: 100%;
  transition: 1s;
  transition-delay: 0s;
}

.button:hover {
  box-shadow: 0 0 10px #2196f3, 0 0 40px #2196f3, 0 0 80px #2196f3;
  background-color: #2196f3;
  transition: 1s;
  transition-delay: 0.3s;
  color: #fff;
}

/* Second Button */

.button2 {
  position: relative;
  color: #d4f321;
  display: inline-block;
  text-transform: uppercase;
  font-size: 24px;
  letter-spacing: 0.7vh;
  padding: 15px 30px;
  overflow: hidden;
}

/* Button Lines */

.button__line2 {
  position: absolute;
  display: block;
}

/* Upper Span */

.button__line-top2 {
  top: 0;
  left: -100%;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, #d4f321);
}

.button2:hover .button__line-top2 {
  left: 100%;
  transition: 1s;
  transition-delay: 0.25s;
}

/* Bottom Span */

.button__line-bottom2 {
  bottom: 0;
  right: -100%;
  width: 100%;
  height: 2px;
  background: linear-gradient(270deg, transparent, #d4f321);
}

.button2:hover .button__line-bottom2 {
  right: 100%;
  transition: 1s;
  transition-delay: 0.25s;
}

/* Left Span */

.button__line-left2 {
  bottom: -100%;
  left: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(360deg, transparent, #d4f321);
}

.button2:hover .button__line-left2 {
  bottom: 100%;
  transition: 1s;
  transition-delay: 0s;
}

/* Right Span */

.button__line-right2 {
  top: -100%;
  right: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(180deg, transparent, #d4f321);
}

.button2:hover .button__line-right2 {
  top: 100%;
  transition: 1s;
  transition-delay: 0s;
}

.button2:hover {
  box-shadow: 0 0 10px #d4f321, 0 0 40px #d4f321, 0 0 80px #d4f321;
  background-color: #d4f321;
  transition: 1s;
  transition-delay: 0.3s;
  color: #fff;
}

/* Third Button */

.button3 {
  position: relative;
  color: #e60000;
  display: inline-block;
  text-transform: uppercase;
  font-size: 24px;
  letter-spacing: 0.7vh;
  padding: 15px 30px;
  overflow: hidden;
}

/* Button Lines */

.button__line3 {
  position: absolute;
  display: block;
}

/* Upper Span */

.button__line-top3 {
  top: 0;
  left: -100%;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, #e60000);
}

.button3:hover .button__line-top3 {
  left: 100%;
  transition: 1s;
  transition-delay: 0.25s;
}

/* Bottom Span */

.button__line-bottom3 {
  bottom: 0;
  right: -100%;
  width: 100%;
  height: 2px;
  background: linear-gradient(270deg, transparent, #e60000);
}

.button3:hover .button__line-bottom3 {
  right: 100%;
  transition: 1s;
  transition-delay: 0.25s;
}

/* Left Span */

.button__line-left3 {
  bottom: -100%;
  left: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(360deg, transparent, #e60000);
}

.button3:hover .button__line-left3 {
  bottom: 100%;
  transition: 1s;
  transition-delay: 0s;
}

/* Right Span */

.button__line-right3 {
  top: -100%;
  right: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(180deg, transparent, #e60000);
}

.button3:hover .button__line-right3 {
  top: 100%;
  transition: 1s;
  transition-delay: 0s;
}

.button3:hover {
  box-shadow: 0 0 10px #e60000, 0 0 40px #e60000, 0 0 80px #e60000;
  background-color: #e60000;
  transition: 1s;
  transition-delay: 0.3s;
  color: #fff;
}