modal.css

/** ELEMENTS DE BASE **/
:root {
  --font-default: "DM Sans", Arial, Helvetica, sans-serif;
  --font-slab: var(--font-default);
  --modal-duration: 0.8s;
}
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  margin: 0;
  display: flex;
  flex-direction: column;
  font-family: var(--font-default);
  font-size: 18px;
  max-width: 1300px;
  margin: 0 auto;
}
p {
  margin-bottom: 0;
  padding: 0.5vw;
}

/** HEADER **/
.header-logo > img {
  padding-right: 1rem;
}
.topnav {
  overflow: hidden;
  margin: 3.5%;
}
.header-logo {
  float: left;
}
.main-navbar {
  height:55px;
  float: right;
}

/** NAVIGATION **/
.topnav a{
  font-weight: 500;
  float: left;
  display: block;
  color: #000000;
  text-align: center;
  padding: 12px 12px;
  margin: 5px;
  text-decoration: none;
  font-size: 20px;
  font-family: Roboto, sans-serif;
}
.topnav a:hover {
  background-color: #ff0000;
  color: #ffffff;
  border-radius: 15px;
}
.topnav a:hover::after{
  position: relative;
  display: block;
  content: "";
  background-color: white;
  height: 1px;
  top: 3px;
}
.topnav a.active {
  background-color: #ff0000;
  color: #ffffff;
  border-radius: 15px;
}
.topnav a.active::after{
  position: relative;
  display: block;
  content: "";
  background-color: white;
  height: 1px;
  top:3px;
}
.topnav .icon {
  display: none;
}

/** MAIN **/
main {
  font-size: 130%;
  font-weight: bolder;
  color: black;
  padding-top: 0.5vw;
  padding-left: 2vw;
  padding-right: 2vw;
  margin: 1px 20px 15px;
  border-radius: 2rem;
  text-align: justify;
}
.hero-section {
  border-radius: 10px;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  overflow: hidden;
  box-shadow: 0 2px 7px 2px rgba(0, 0, 0, 0.2);
  margin-bottom: 10px;
}
.hero-content {
  padding: 51px 67px;
  grid-column: span 4;
  background: #232323;
  color: #fff;
  position: relative;
  text-align: left;
  min-width: 510px;
}
.hero-content > * {
  position: relative;
  z-index: 1;
}
.hero-headline {
  font-size: 6rem;
  font-weight: normal;
  white-space: nowrap;
}
.hero-text {
  font-weight: normal;
  margin-top: 57px;
  padding: 0;
}
.hero-img {
  grid-column: span 8;
}
.hero-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  padding: 0;
}


/** BOUTONS JE M'INSCRIS ET C'EST PARTI **/
.hero-section > .btn-signup {
  display: none;
}
.btn-submit,
.btn-signup {
  background: #fe142f;
  display: block;
  margin: 0 auto;
  border-radius: 7px;
  font-size: 1rem;
  padding: 12px 82px;
  color: #fff;
  cursor: pointer;
  border: 0;
}
.btn-signup {
  outline: none;
  text-transform: capitalize;
  font-size: 1.3rem;
  padding: 15px 23px;
  margin: 0;
  margin-top: 59px;
}

/** MODAL FORMULAIRE **/
.bground{
  display: none;
  position: fixed;
  z-index: 1;
  left: 0;
  top: 0;
  height: 100%;
  width: 100%;
  overflow: auto;
  background-color: rgba(26, 39, 156, 0.4);
}
.content {
  margin: 100px auto;
  width: 100%;
  max-width: 500px;
  animation-name: modalopen;
  animation-duration: var(--modal-duration);
  background: #232323;
  border-radius: 10px;
  overflow: hidden;
  position: relative;
  color: #fff;
  padding-top: 10px;
}
.modal-body {
  padding: 15px 8%;
  margin: 15px auto;
}
label {
  font-family: var(--font-default);
  font-size: 17px;
  font-weight: normal;
  display: inline-block;
  margin-bottom: 11px;
}
input {
  padding: 8px;
  border: 0.8px solid #ccc;
  outline: none;
}
.text-label {
  font-weight: normal;
  font-size: 14px;
}
.text-control {
  margin: 0;
  padding: 8px;
  width: 100%;
  border-radius: 8px;
  font-size: 20px;
  height: 48px;
}
.formData[data-error]::after {
  content: attr(data-error);
  font-size: 0.4em;
  color: #e54858;
  display: block;
  margin-top: 7px;
  margin-bottom: 7px;
  text-align: right;
  line-height: 0.3;
  opacity: 0;
  transition: 0.3s;
}
.formData[data-error-visible="true"]::after {
  opacity: 1;
}
.formData[data-error-visible="true"] .text-control {
  border: 2px solid #e54858;
}
.checkbox-label,
.checkbox2-label {
  position: relative;
  margin-left: 36px;
  font-size: 12px;
  font-weight: normal;
}
.checkbox-label .checkbox-icon,
.checkbox2-label .checkbox-icon {
  display: block;
  width: 20px;
  height: 20px;
  border: 2px solid #279e7a;
  border-radius: 50%;
  text-indent: 29px;
  white-space: nowrap;
  position: absolute;
  left: -30px;
  top: -1px;
  transition: 0.3s;
}
.checkbox-label .checkbox-icon::after,
.checkbox2-label .checkbox-icon::after {
  content: "";
  width: 13px;
  height: 13px;
  background-color: #279e7a;
  border-radius: 50%;
  text-indent: 29px;
  white-space: nowrap;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  transition: 0.3s;
  opacity: 0;
}
.checkbox-input {
  display: none;
}
.checkbox-input:checked + .checkbox-label .checkbox-icon::after,
.checkbox-input:checked + .checkbox2-label .checkbox-icon::after {
  opacity: 1;
}
.checkbox-input:checked + .checkbox2-label .checkbox-icon {
  background: #279e7a;
}
.checkbox2-label .checkbox-icon {
  border-radius: 4px;
  border: 0;
  background: #c4c4c4;
}
.checkbox2-label .checkbox-icon::after {
  width: 7px;
  height: 4px;
  border-radius: 2px;
  background: transparent;
  border: 2px solid transparent;
  border-bottom-color: #fff;
  border-left-color: #fff;
  transform: rotate(-55deg);
  left: 21%;
  top: 19%;
}

/** MODAL DE REMERCIEMENTS **/
.bground-thanks {
  display: none;
  position: fixed;
  z-index: 1;
  left: 0;
  top: 0;
  height: 100%;
  width: 100%;
  overflow: auto;
  background-color: rgba(26, 39, 156, 0.4);
}
.text-thanks{
  padding-top:250px;
  font-size: 30px;
  line-height: 40px;
  width: 100%;
  height: 612px;
  text-align: center;
}
.close{
  position: absolute;
  right: 15px;
  top: 15px;
  width: 32px;
  height: 32px;
  opacity: 1;
  cursor: pointer;
  transform: scale(0.7);
}
.close:before,
.close:after {
  position: absolute;
  left: 15px;
  content: " ";
  height: 33px;
  width: 3px;
  background-color: #fff;
}
.close:before {
  transform: rotate(45deg);
}
.close:after {
  transform: rotate(-45deg);
}

/** FOOTER **/
footer {
  margin: 0 20px;
}
.copyrights {
  color: #fe142f;
  padding: 0;
  font-size: 1rem;
  margin: 60px 0 30px;
  font-weight: bolder;
}

/** MOBILE RESPONSIVE **/
@media screen and (max-width: 540px) {
  .header-logo > img{
    width: 103px;
    padding-top: 20px;
    padding-left: 15px;
    padding-right:0;
  }
  .topnav a {
    display: none;
  }
  .topnav .icon {
    float: right;
    display: block;
    margin-top: -15px;
  }
} 
@media screen and (max-width: 800px) {
  .main-navbar{
    height: 100%;
    padding-top: 50px;
  }
  .content {
    margin: 20% auto;
  }
  .topnav a {
    display: none;
  }
  .topnav .icon {
    color:#fe142f;
    float: right;
    display: block;
    padding: 12px 12px;
    margin: 5px;
    text-decoration: none;
    font-size: 20px;
  }
  .topnav.responsive {
    position: relative;
  }
  .topnav.responsive .icon {
    position: absolute;
    right: 0;
    top: 0;
  }
  .topnav.responsive a {
    float: none;
    display: block;
    text-align: left;
  }
  .hero-section {
    display: block;
    box-shadow: unset;
  }
  .hero-content {
    min-width: 100%;
    background: #fff;
    color: #000;
    padding: 0px;
  }
  .hero-content .btn-signup {
    display: none;
  }
  .hero-headline {
    font-size: 2.7rem;
    white-space: normal;
  }
  .hero-text {
    font-size: 0.9rem;
  }
  .hero-img img {
    border-radius: 10px;
    margin-top: 40px;
  }
  .hero-section > .btn-signup {
    display: block;
    margin: 32px auto 10px;
    padding: 12px 35px;
  }
  .copyrights {
    margin-top: 50px;
    text-align: center;
  }
}

/** KEYFRAME ANIMATION **/
@keyframes modalopen {
  from {
    opacity: 0;
    transform: translateY(-150px);
  }
  to {
    opacity: 1;
  }
}