<div class="font25">The Bug!</div>

.font25{
  position: relative;
  font-size: 24px;
  font-weight: 900;
  color: #1630f1;
  letter-spacing: 10px;
  background-color: #ffffff;
}
.font25:after{
  content: '';
  position: absolute;
  top: 0;
  z-index: 10;
  background-color: inherit;  /* 继承背景色使伪元素遮挡住后面 */
  animation: text-ani25 2.4s linear infinite;
  animation-delay: 2s;
}
@keyframes text-ani25{
  0%{
    content: "$-";
    left: 0;
  }
  5%{
    content: ";y";
    left: 0;
  }
  10%{
    content: "*&#H";
    left: 0;
  }
  15%{
    content: "-!);";
    left: 0;
  }
  20%{
    content: "#$_}-'";
    left: 0;
  }
  25%{
    content: ":0^!$.";
    left: 0;
  }
  30%{
    content: "#{+.-?#u";
    left: 0;
  }
  35%{
    content: "f7*%}-;#";
    left: 0;
  }
  40%{
    content: "^='?'*$!";
    left: 0;
  }
  45%{
    content: "+0^&!`^-";
    left: 0;
  }
  50%{
    content: "&-?>-=|`";
    left: 0;
  }
  55%{
    content: "u<|:#-";
    left: auto;
    right: 0;
  }
  60%{
    content: ";~0![,";
    left: auto;
    right: 0;
  }
  65%{
    content: ")+->";
    left: auto;
    right: 0;
  }
  70%{
    content: "+.=d";
    left: auto;
    right: 0;
  }
  75%{
    content: "&%";
    left: auto;
    right: 0;
  }
  80%{
    content: "`@";
    left: auto;
    right: 0;
  }
  85%{
    content: "-";
    left: auto;
    right: 0;
  }
  90%{
    content: "#";
    left: auto;
    right: 0;
  }
  95%{
    content: "";
    left: 0;
  }
  100%{
    content: "";
    left: 0;
  }
}