[Help] Button is not clickable at specific window sizes

.status.sign-in {
  display: inline-block;
  padding: 6px 12px;
  margin-bottom: 0;
  font-size: 14px;
  font-weight: normal;
  line-height: 1.428571429;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  background-image: none;
  border: 0px solid transparent;
  white-space: nowrap;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  -o-user-select: none;
  user-select: none;
  color: #ffffff;
  background-color: #2ecc71;
  border-color: #29b765;
  padding: 10px 16px;
  font-size: 18px;
  line-height: 1.33;
  border-radius: 0px;
  display: block;
  width: 100%;
  padding-left: 0;
  padding-right: 0;
}
.status.sign-in:focus {
  outline: thin dotted #333;
  outline: 5px auto -webkit-focus-ring-color;
  outline-offset: -2px;
}
.status.sign-in:hover,
.status.sign-in:focus {
  color: #333333;
  text-decoration: none;
}
.status.sign-in:active,
.status.sign-in.active {
  outline: 0;
  background-image: none;
  -webkit-box-shadow: inset 0 3px 5px rgba(0, 0, 0, 0.125);
  box-shadow: inset 0 3px 5px rgba(0, 0, 0, 0.125);
}
.status.sign-in.disabled,
.status.sign-in[disabled],
fieldset[disabled] .status.sign-in {
  cursor: not-allowed;
  pointer-events: none;
  opacity: 0.65;
  filter: alpha(opacity=65);
  -webkit-box-shadow: none;
  box-shadow: none;
}
.status.sign-in:hover,
.status.sign-in:focus,
.status.sign-in:active,
.status.sign-in.active,
.open .dropdown-toggle.status.sign-in {
  color: #ffffff;
  background-color: #26ab5f;
  border-color: #1e854a;
}
.status.sign-in:active,
.status.sign-in.active,
.open .dropdown-toggle.status.sign-in {
  background-image: none;
}
.status.sign-in.disabled,
.status.sign-in[disabled],
fieldset[disabled] .status.sign-in,
.status.sign-in.disabled:hover,
.status.sign-in[disabled]:hover,
fieldset[disabled] .status.sign-in:hover,
.status.sign-in.disabled:focus,
.status.sign-in[disabled]:focus,
fieldset[disabled] .status.sign-in:focus,
.status.sign-in.disabled:active,
.status.sign-in[disabled]:active,
fieldset[disabled] .status.sign-in:active,
.status.sign-in.disabled.active,
.status.sign-in[disabled].active,
fieldset[disabled] .status.sign-in.active {
  background-color: #2ecc71;
  border-color: #29b765;
}
.status.sign-in:before {
  position: relative;
  top: 2px;
  display: inline-block;
  font-family: 'Glyphicons Regular';
  font-style: normal;
  font-weight: normal;
  line-height: 1;
  -webkit-font-smoothing: antialiased;
  content: "\E045";
  margin-right: 8px;
}
.status.sign-in:before:empty {
  width: 1em;
}
/r/bootstrap Thread