styles.css

popup_container {
  font-family:Helvetica sans-serif
  position: fixed;
  top: 20%;
  left: 50%;
  width:100%;
  height:100%;
  opacity:.95;
  top:0;
  left:0;
  display:none;
  position:fixed;
  background-color:#313131;
  overflow:auto
}

#popup {
  position:absolute;
  display: flex;
  justify-content: center;
  left:50%;
  top:17%;
  margin-left:-202px;
}

#form {
  max-width:300px;
  min-width:250px;
  padding:10px 50px;
  border:2px solid gray;
  border-radius:10px;
  font-family:raleway;
  background-color:#fff
}

#header_container {
  margin-left: auto;
  margin-right: auto;
  display: flex;
  width: 1000px;
}
#bug_text_container {
  margin-left: 100px;
}
#bug_image {
  height: 100px;
  width: auto;
}

#submit_btn {
margin-left: auto;
margin-right: auto;
margin-bottom: 20px;
text-decoration:none;
  margin-top: 20px;
  width: 200px;
  text-align:center;
  display:block;
  background-color:#1a0000;
  color:#fff;
  border:1px solid #1a0000;
  padding:10px 0;
  font-size:20px;
  cursor:pointer;
  border-radius:5px
}

#submit_btn:hover {
  background-color:#cc0000;
  border:1px solid #cc0000;
}

.input_field {
  margin-top: 10px;
  display: flex;
}

.inputs {
  margin-left:auto;
  margin-right:0;
  margin-top: 13px;
  height: 30px;
  width: 150px;
  border-radius: 3px;
}

button {
  position: fixed;
  top: 15%;
  text-align:center;
  display:block;
  background-color:blue;
  color:#fff;
  border:1px solid blue;
  padding:10px;
  font-size:20px;
  cursor:pointer;
  border-radius:5px
}